Version 1.30

- ENH: Add global and buffer-local whitelists / blacklists to explicitly include / exclude certain comment prefixes.
- Handle readonly and nomodifiable buffers by printing just the warning / error, without the multi-line function error.
- FIX: Now handling three-piece comments correctly. The start may set a positive indent offset for the middle and end comment prefixes that must be considered.
- FIX: Suppress 'ignorecase' in s:Literal().
Version 1.31

Also define opposite g<< commands with g:IndentCommentPrefix_alternativeOriginalCommands. It's good for consistency (my muscle memory often cannot distingish indenting from dedenting), and necessary when using the g:IndentCommentPrefix_Whitelist, because those work not just in column 1 (where dedenting is not possible), but in any column.