man pages have "Version @catdoc_version@" in footer

`man catdoc` displays
> MS-Word reader     Version @catdoc_version@     catdoc(1)

instead of "Version 0.95"; the other man pages show the same.

Nothing I can see sets the ouput variable `catdoc_version`. However, configure.in has `AC_SUBST(PACKAGE_VERSION)` which sets `PACKAGE_VERSION`, and changing the .1.in manpage source files to use `@PROGRAM_VERSION` fixes this.
