[enh] generic indentation detection for EndlProxy
[enh] don't break the next block indentation in EndlProxy
[mod] update TODO
[mod] update TODO
[mod] new tests todo list, for blank lines in endl proxy this line
[mod] rename endl proxy to line proxy because this is closer to reality
[mod] remove useless method
[enh] include blank lines in LineProxy
[mod] remove useless code
[mod] DRY
[fix] include the real blank line in line proxy, not the line after
[doc] docstring for GenericNodesUtils
[mod] update TODO