close temp file after writing

git-svn-id: svn://svn.icculus.org/fs2open@10433 387891d4-d844-0410-90c0-e4c51a9137d3
wait until the installer has shut down before shutting down logging

git-svn-id: svn://svn.icculus.org/fs2open@10434 387891d4-d844-0410-90c0-e4c51a9137d3
name the ProgressBarDialog

git-svn-id: svn://svn.icculus.org/fs2open@10435 387891d4-d844-0410-90c0-e4c51a9137d3