[pca] wget stalls

[Martin Paul]

I have changed the current development release of pca (20090610-01) now 
to set either http_proxy or https_proxy for wget (depending on the 
protocol used) when pca's wgetproxy option is set.

wget's docs are a little weak here - while wget always required 
<prot>_proxy to be set for <prot>:// URLs, https_proxy wasn't documented 
for quite some time. Even the most recent sample.wgetrc included in the 
wget distribution lists http_proxy and ftp_proxy, but not https_proxy. 
The man page doesn't talk about *_proxy at all.

Thanks to Paul for bringing this to my attention and to Glenn for the 
pointers and confirmation!

Martin.