[pca] Possible patch download failures

[Martin Paul]

Due to some recent backend changes in the Oracle patch download service there 
might be issues with failing patch downloads with PCA in certain situations:

If you are using a firewall which restricts outgoing access, it might be 
necessary to add a few extra rules for the new additional content distribution 
networks used by Oracle. Look at the bottom of the online PCA installation 
instructions for a list.

If you must use a local web proxy to access outside systems and use PCA's 
wgetproxy option to set that, it might be possible that PCA does not set the 
correct options for wget and patch downloads fail. Please use the current 
development version of PCA, which contains a fix. A new stable version including 
the fix will appear soon.

Martin.