BUG: Installation directory for symlinks and scripts was wrong and symli...

...nks have been recreated under a mac environment

Differences with previous versions:

http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=dtiprocess&revision=159
http://www.nitrc.org/plugins/scmsvn/viewcvs.php?view=rev&root=dtiprocess&revision=160