Moved packages into sub directories easing the use of additional
installation files (e.g. patches).
Calling sit now with the following syntax:
[OPTIONS] ./sit <category>/<package>/<package>-<version>
* Berkeley UPC translator (source to source compiler)
* Berkeley UPC (runtime)
The environment variable BUPC_TRANSLATOR has to be defined by the
berkeley_upc_translator module to build Berkeley UPC.