+ proofreading fixes up to part 5 - coding conventions
+ rephrase regex notes and document region features of the block
type filter for tree viewers
* colorer regexps are limited to one line only
ignorecase legacy treatment
+ simple regexp and region to find and colorize one line comment
+ define region for python keywords and make a list of them to highlight
+ base scheme
+ Python is no more rare
+ start with skeleton