reference selected mods by their path, not their name, because we can have duplicate node names

git-svn-id: svn://svn.icculus.org/fs2open/trunk@10675 387891d4-d844-0410-90c0-e4c51a9137d3
properly check for Basic Installation mods

git-svn-id: svn://svn.icculus.org/fs2open/trunk@10676 387891d4-d844-0410-90c0-e4c51a9137d3
additional help text on suggestion of MjnMixael

git-svn-id: svn://svn.icculus.org/fs2open/trunk@10677 387891d4-d844-0410-90c0-e4c51a9137d3
bump version

git-svn-id: svn://svn.icculus.org/fs2open/trunk@10678 387891d4-d844-0410-90c0-e4c51a9137d3
don't mess with the buffer if we haven't read anything yet
(this bug was here all along, but only manifests for 7z files smaller than the buffer size!)

git-svn-id: svn://svn.icculus.org/fs2open/trunk@10679 387891d4-d844-0410-90c0-e4c51a9137d3