Modifying makefiles to allow user group and install dir to be overridden so that 'make install' can be used to build binary packages for release.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6400 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on July 4, 2008
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