Delete mention of direction from checkboxgroup.

It was never implemented.
TNL-231

common/lib/xmodule/xmodule/js/spec/problem/edit_spec.coffee

@@ -724,7 +724,7 @@ describe 'MarkdownEditingDescriptor', ->
 
         <p>Choice checks</p>
         <choiceresponse>
-          <checkboxgroup direction="vertical">
+          <checkboxgroup>
             <choice correct="false">option1 [x]</choice>
             <choice correct="true">correct</choice>
             <choice correct="true">redundant</choice>

common/lib/xmodule/xmodule/js/spec/problem/edit_spec_hint.coffee

@@ -188,7 +188,7 @@ describe 'Markdown to xml extended hint checkbox', ->
     <problem>
     <p>Select all the fruits from the list</p>
     <choiceresponse>
-      <checkboxgroup label="Select all the fruits from the list" direction="vertical">
+      <checkboxgroup label="Select all the fruits from the list">
         <choice correct="true">Apple
           <choicehint selected="true">You're right that apple is a fruit.</choicehint>
           <choicehint selected="false">Remember that apple is also a fruit.</choicehint></choice>
@@ -209,7 +209,7 @@ describe 'Markdown to xml extended hint checkbox', ->
 
     <p>Select all the vegetables from the list</p>
     <choiceresponse>
-      <checkboxgroup label="Select all the vegetables from the list" direction="vertical">
+      <checkboxgroup label="Select all the vegetables from the list">
         <choice correct="false">Banana
           <choicehint selected="true">No, sorry, a banana is a fruit.</choicehint>
           <choicehint selected="false">poor banana.</choicehint></choice>
@@ -266,7 +266,7 @@ describe 'Markdown to xml extended hint checkbox', ->
     <problem>
     <p>Select all the fruits from the list</p>
     <choiceresponse>
-      <checkboxgroup label="Select all the fruits from the list" direction="vertical">
+      <checkboxgroup label="Select all the fruits from the list">
         <choice correct="true">Apple
           <choicehint selected="true">You're right that apple is a fruit.</choicehint>
           <choicehint selected="false">Remember that apple is also a fruit.</choicehint></choice>
@@ -287,7 +287,7 @@ describe 'Markdown to xml extended hint checkbox', ->
 
     <p>Select all the vegetables from the list</p>
     <choiceresponse>
-      <checkboxgroup label="Select all the vegetables from the list" direction="vertical">
+      <checkboxgroup label="Select all the vegetables from the list">
         <choice correct="false">Banana
           <choicehint selected="true">No, sorry, a banana is a fruit.</choicehint>
           <choicehint selected="false">poor banana.</choicehint></choice>
@@ -753,7 +753,7 @@ describe 'Markdown to xml extended hint with multiline hints', ->
     <problem>
     <p>Checkboxes</p>
     <choiceresponse>
-      <checkboxgroup label="Checkboxes" direction="vertical">
+      <checkboxgroup label="Checkboxes">
         <choice correct="true">A
           <choicehint selected="true">aaa</choicehint>
           <choicehint selected="false">bbb</choicehint></choice>
@@ -891,7 +891,7 @@ describe 'Markdown to xml extended hint with tricky syntax cases', ->
     <p>q1</p>
     <p>this [x]</p>
     <choiceresponse>
-      <checkboxgroup label="q1" direction="vertical">
+      <checkboxgroup label="q1">
         <choice correct="false">a [square]</choice>
         <choice correct="true">b {{ this hint passes through }}</choice>
       </checkboxgroup>

common/lib/xmodule/xmodule/js/src/problem/edit.coffee

@@ -353,7 +353,7 @@ class @MarkdownEditingDescriptor extends XModule.Descriptor
           var groupString = '<choiceresponse>\n',
               options, value, correct;
 
-          groupString += '  <checkboxgroup direction="vertical">\n';
+          groupString += '  <checkboxgroup>\n';
           options = match.split('\n');
           
           endHints = '';  // save these up to emit at the end

common/lib/xmodule/xmodule/templates/problem/checkboxes_response.yaml

@@ -29,7 +29,7 @@ data: |
         <p>You can use the following example problem as a model.</p>
           <p>The following languages are in the Indo-European family:</p>
           <choiceresponse>
-            <checkboxgroup direction="vertical">
+            <checkboxgroup>
               <choice correct="true" name="urdu">Urdu</choice>
               <choice correct="false" name="finnish">Finnish</choice>
               <choice correct="true" name="marathi">Marathi</choice>

common/lib/xmodule/xmodule/templates/problem/checkboxes_response_hint.yaml

@@ -41,7 +41,7 @@ data: |
       
       <p>Which of the following is a fruit? Check all that apply.</p>
       <choiceresponse>
-        <checkboxgroup direction="vertical">
+        <checkboxgroup>
           <choice correct="true">apple
             <choicehint selected="true">You are correct that an apple is a fruit because it is the fertilized ovary that comes from an apple tree and contains seeds.</choicehint>
             <choicehint selected="false">Remember that an apple is also a fruit.</choicehint>

common/lib/xmodule/xmodule/tests/test_capa_module.py

@@ -1822,7 +1822,7 @@ class TestProblemCheckTracking(unittest.TestCase):
               </multiplechoiceresponse>
               <p>Which of the following are musical instruments?</p>
               <choiceresponse>
-                <checkboxgroup direction="vertical" label="Which of the following are musical instruments?">
+                <checkboxgroup label="Which of the following are musical instruments?">
                   <choice correct="true">a piano</choice>
                   <choice correct="false">a tree</choice>
                   <choice correct="true">a guitar</choice>