updated installer. svn-externals processing begin, seems to be finding externals and calculating urls on git hub correctly for any trunk project. Others are unknown.

git-svn-id: svn+ssh://civmxsrv2.duhs.duke.edu/Users/civmsvn/svn/repos/workstation_code/trunk@2104 d41079a3-eaa1-4f09-8506-b324c47726bb
installer updated, svn-externals now fetch properly. In addition they add to .gitignore files to prevent any accidental add all shenanigans.

git-svn-id: svn+ssh://civmxsrv2.duhs.duke.edu/Users/civmsvn/svn/repos/workstation_code/trunk@2105 d41079a3-eaa1-4f09-8506-b324c47726bb
inst-svn_external merge issue