More changes to the Fink CCP4 package

The main change is to move /sw/share/xtal/ccp4-6.3.0 to /sw/opt/ccp4-6.3.0.  This change of location is to remove a 10 year old violation of fink packaging policy. Briefly, packages with their own unix-like filesystem hierarchy (bin, lib, include, share, etc), should go into /sw/opt/packagename, whereas /sw/share is for platform-indepenent files (text files and so on).