[pca] Query latest pca and patchdiag.xref file (errors?)

[Martin Paul]

Glen,

>>>> If you can reproduce the problems, re-run pca with "--debug" and send me the output.
> Do not have the old patchdiag.xref file but can reproduce.  Here's the console output for the first patch:

Thanks, and sorry that I didn't try it on my own at first - I can 
reproduce the issue. It's caused by the (kind of unusual, but still 
allowed) combination of command line options:

> /var/tmp/pca --pretend /var/tmp/patchlist.txt --patchdir="/var/tmp/pcatmp" --safe --readme --debug

The reason why pca shows "NOT FOUND" for all patches here is a special 
short cut in pca's code: When it finds the --readme option and only full 
patch ID+revision as arguments on the command line, it skips reading the 
xref file for speed-up - which is a good thing.

But this causes troubles when an additional option like 
--pretend/--install/--download/etc. is specified, as it then tries to 
use information which it never has read.

I will take a closer look tomorrow and maybe integrate a fix to make it 
go through the full reading of xref and analysis when any other 
action-option but --readme is specified.

Astonishing - after all the years, I see pca used in new ways again and 
again :-)

Martin.