one: avoid filesystem block deduplication
Check for std-options: --help and --version
Ship xnest in RPM subpackage, remove obsolete scripts
rpm: Add proper requirements for subpackages
man pages: Properly escape period at line pos1
rpm: use valid Group:
consolidate build time substitution in one script

Consolidate all $(SED) based build rules into a single shell script
"package-subst" and use that for substituting text in all man pages,
shell and python scripts.
man: add watch-xsel(1)
man: fix formatting