autoconf does not support docdir etc. specified in current GNU Coding Standards

[Julian Gilbey]

Autoconf 2.59 does not yet support docdir or various of the other
installation directories specified by the current version of the GNU
Coding Standards (even though the standards say:

`docdir'
     The directory for installing documentation files (other than Info)
     for this package.  By default, it should be
     `/usr/local/share/doc/YOURPKG', but it should be written as
     `$(datarootdir)/doc/YOURPKG'.  (If you are using Autoconf, write
     it as address@hidden@'.)  The YOURPKG subdirectory, which may include a
     version number, prevents collisions among files with common names,
     such as `README'.

suggesting that Autoconf supports it already!)

   Julian