Specifying man dir in installation

Hi, A-A-P developers,

I have a small bug report for the Aap installation process.

As of 1.093, Aap's installation unconditionally puts its man pages in 
man/ directly under $PREFIX. From main.aap:

         mandir = $PREFIX/man/man1

But some platforms, including OS X, have man under $PREFIX/share/man, 
even when installing to /usr/local.

Could we get an option in the Aap installation formula to allow users to 
specify the location of the man directory underneath $PREFIX?

Cheers,
Andrew Janke


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