packaging:

- set_version.sh also sets the version in the MacOSX packaging files now.
- Incorporated set_version.sh into Makefile target client_package_macosx.


git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@2924 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534