[pca] patchdiag.xref shrunk

[Martin Paul]

With today's patchdiag.xref ("AS OF Jul/12/11") many patches have disappeared 
from the file.

At a quick glance, it seems that it affects patches for old Solaris versions (up 
to Solaris 7), patches for old unbundled software and nearly all of the over 
5000 unbundled "PTF/RMLS" patches. There are too many diffs to check all of them 
manually, but I'm pretty sure that no patches for reasonably recent software is 
affected.

Maybe Don can provide more detail, on which groups of patches have been removed 
and why?

BTW - a quick comparison of the runtime of a typical PCA command shows a speedup 
of about 40%, due to the reduced number of patches to analyze.

Martin.