Merge branch 'next'

* next:
  fix missing version links for DSO
  bldchn, create .pc pkg-config files at make time
  bldchn, add do_subst function
  bldchn, info pages depend on VERSION
  bldchn, man pages depend on VERSION
  bldchn, add missing links to libversion.a
  use uterus_version_string instead of PACKAGE_VERSION
  bldchn, gengetopt files are using version.h
  build version.c and libversion.a
  bldchn, generate version.mk at configure and make time
  import git-version-gen, etc. from twstools v0.4.0-54-g5e023df
  bldchn, never use AC_INIT's version info