Enabling the rounding in #16837 has been causing noticeable (up to 1 percentage
point) differences between non-rounded subsection grades and a total grade for
a course. This increases the grade precision to reduce the negative
implications of double rounding.
- Moving xmodule folder to root as we're dissolving sub-projects of common folder in edx-platform
- More info: https://openedx.atlassian.net/browse/BOM-2579
- -e common/lib/xmodule has been removed from the requirements as xmodule has itself become the part of edx-platform and not being installed through requirements
- The test files common/lib/xmodule/test_files/ have been removed as they are not being used anymore
