Fmlib_std

• Performance improvement 'Array.replace'

Fmlib_pretty

• Added function 'write_to_channel'

Fmlib_parse

• Changed signature of repetition combinators (e.g. 'one_or_more' and 'zero_or_more').
• Added a generic parsing combinator for parsing of operator expressions.
• Complete rework of layout parsing.
• Added functions to pretty print error messages and code snippets containing an error.
• Documentation for parsing improved and augmented significantly.