More carefully manage prepend of bin_dir to PATH.  This was failing on Windows, when bin_dir was empty and we were prepending with a colon instead of semicolon.  Now, test for non-empty string and use appropriate PATH spearator (hand-coded for now).
More carefully manage prepend of bin_dir to PATH.  This was failing on Windows, when bin_dir was empty and we were prepending with a colon instead of semicolon.  Now, test for non-empty string and use appropriate PATH spearator (hand-coded for now).

Thanks to Bill for pointing me at a useful test case.


git-svn-id: dcef21d3ff4cbd8dced82702dcaad637bf246ecc@1908 aa0779c3-6ec2-4b84-a212-a405c134cd8d

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