Remove --publish switch

For now it makes no sense to use --publish. It will make
sense to use it when keep multiple versions of the older docs
around. For now stay with the latest published version only.
Remove all the condition="sgi_termlength:*"

These condition include pieces of documentation depending
on the value of sgi_termlength being wide, narrow or standard.
This is likely an artifact of some older SGI docbook environment.
Simply ship all the pieces of the docbook unconditionally.
Merge branch 'publican-fixes' of https://github.com/mbaldessari/pcp into dev