SVN users: xia2core now imported into xia2

If you use xia2 from subversion, you will see a fairly big update where xia2core is pulled into xia2/core - this was proposed a couple of weeks ago and no objections raised. The xia2core directory you have checked out is no longer needed.

Set up is now simpler:

 - export XIA2_ROOT=/path/to/xia2

 - source $XIA2_ROOT/setup.sh

or the bash / csh equivalent.  A corresponding release will be made available later today, once I have slimmed down the bundle.

This will also fix the phenix issue mentioned in the previous post...