[mod] remove debug print
[doc] update link to demonstration commit
[mod] refactoring
[enh] have a stack of called node
[enh] handle all case of comments
[mod] split test
[enh] replace  by repr()
[enh] try to handle space before comment cases, not yet very good :/
[mod] pep8
[enh] split import accross multiple lines
[mod] remove debug print