Since prepending/appending PATH on Windows doesn't just affect the .bat file, but instead the environment of the calling command prompt, need to protect prepend so doesn't happen multiple times.  Also correct some issues with quoting and addition of lib dirs in dakota.bat.
Since prepending/appending PATH on Windows doesn't just affect the .bat file, but instead the environment of the calling command prompt, need to protect prepend so doesn't happen multiple times.  Also correct some issues with quoting and addition of lib dirs in dakota.bat.

git-svn-id: dcef21d3ff4cbd8dced82702dcaad637bf246ecc@1509 aa0779c3-6ec2-4b84-a212-a405c134cd8d

pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA,pemryan/DAKOTA