updated inst-ants to check for mac. added a start_at option to install to jump past unnecessary options.

git-svn-id: svn+ssh://civmxsrv2.duhs.duke.edu/Users/civmsvn/svn/repos/workstation_code/trunk@2118 d41079a3-eaa1-4f09-8506-b324c47726bb
installer updates, changed subroutines and order pm to look for specified prefix/file to process instead of hardcoding install/inst-*

git-svn-id: svn+ssh://civmxsrv2.duhs.duke.edu/Users/civmsvn/svn/repos/workstation_code/trunk@2119 d41079a3-eaa1-4f09-8506-b324c47726bb
installer updates, moved prerequs to a handle instead of check, changed program installations to new prefix "prog"
added a process stages function to subroutines, callled inside handle_prereqs doing the sameish thing as install does.

git-svn-id: svn+ssh://civmxsrv2.duhs.duke.edu/Users/civmsvn/svn/repos/workstation_code/trunk@2120 d41079a3-eaa1-4f09-8506-b324c47726bb