simplified to rst_section for all the sections
further simplification: now it does not depend on section_cysle. Besides, added silent to the mappings.
Remapped original to ctr-u notation. Warning: RstSectionStandardize() should be reviewed since it does not work properly with non ascii chars
added line_no sense to ul_from_lines() and removed buf unused param
replaced RstSectionsStandardize() to allow it working on non ascii chars. There remains some problems with this function (see TODO). Anyway, by now it does not urge to me. I have not figure out any use of it yet.