[pca] problems with 137137 kernel patch

[Martin Paul]

Hi Gerard,

> # /etc/scripts/pca -i 137137-09
> ...
> calypso-root% /etc/scripts/pca -l 140774

There is a small but important difference between these two commands. 
One time you are specifying a patch ID plus revision, the other time 
just a patch ID.

In the first case, pca will not look at dependencies of the patch but 
list/download/install exactly this patch. Sometimes one needs that, 
especially when downloading older revisions of a patch or explicitely 
one patch for a different OS release.

In the second case, pca will look for the most recent revision of the 
patch and all the patches it requires.

When I decided on that behaviour a long time ago, I chose not to use an 
extra option. It's not needed, and it would give the wrong impression 
that pca could resolve dependencies for past revisions of patches as 
well - this is not possible, as the information is missing from the xref 
file.

Martin.