Stage www/autoindex2

The original port had several issues with it beyond staging. For example,
the INSTALLDIR mechanism didn't work because the PLIST_SUB was hardcoded
for WWWDIR. All sorts of CHMOD'ing was going on because COPYTREE_SHARE
hadn't been used. The config.php was installed directly and therefore
overwritten and/or removed each time the port was de/reinstalled. The
prefetch didn't work because it checked if INSTALLDIR was defined, but
the makefile always defines it. The whole thing had to be reworked, so
very little of provided patch actually got used.

PR: 190009
Submitted by: Joe (thralling.com)
Approved by: Nobody, maintainer was reset
Lotsa TLC: marino