rewrite of __key_value, now support nerarly every value
added option comment_line to prefix key value with a comment line
updated the man page ....
Merge branch 'master' of https://github.com/telmich/cdist into bugfix_type__key_value
implemented some suggestions from steven
corrected some debug codesnips
work around a bug in bash3, now tested with dash, bash, busybox
ups, typo ... thx to steven
Merge branch 'dheule/bugfix_type__key_value' into production