[enh] reput debug output from old space grouper in inner_formatting_grouper
Revert "[mod] don't group space anymore as a separate formatting artefact", going to adapt it to new behavior

This reverts commit e26f4f6cee83c4bc25bed72b4e493382651eca53.
[mod] DRY
[mod] rename space_grouper and test into formatting_grouper
[mod] move test of formatting grouper to the new format
[mod] remove error handling from formatting_grouper, this is not the place to do that anymore
[mod] fix imports
[enh] move space formatting to new behavior
[enh] move indentation marker process to new format
[enh] real debug output on fail in inner_Formattin_grouper
[fix] debug output of inner formatting was ditching formating
[mod] show more lines in debug output
[mod] refactor, extract debug stuff from loop
[mod] inner formatting grouper tests were still in the old format
[fix] missing argument
[mod] move inner formatting grouper to new format
[mod] display the buggy token
[fix] debug output of inner grouper, string is immutable
[mod] start to commit modifications to pass pypi top 100; don't remove \ from the end of a comment
[mod] remove old format