[BZ1004869] jcr2vfs: fix comments (# -> //) migration

 * end of lines were thrown away, thats fixed now
 * comments _not_ starting at the start of line are migrated too
   e.g. 'some text # comment' 'some text // comment'
 * hash tags inside double and single qoutes are not touched
 * DSL debug mark '#/' is not touched
 * escaped quotes (\' and \") are ignored