man page improvements

- simplify, update and sort the command line options, also unifying them
  among the various man pages
- use a bit more docbook markup (tags and entities)
- remove old note about suse < 9.1
- add man sections in "see also" paragraphs
- grammar fixes (typo fixes, remove contractions, etc)
- remove traling spaces
add a man page for icecc-create-env