[pca] Changes on SunSolve cause problems with pca

[Martin Paul]

The most recent development version of pca (20090818-01) features two 
changes:

* Ignore ssprot option for patch downloads, which require HTTPS

I have not removed the ssprot option completely (yet), as it can still 
be used when downloading the patchdiag.xref file, and it's unknown at 
this time what's going to happen with downloads of READMEs.

* Find the newest wget binary with the best protocol support

Until now, pca used the first wget it found. Now it checks for the best 
one. It will prefer wget with HTTPS support over one with HTTP only, and 
the wget with a higher version number if it supports at least the same 
protocols.

Documentation for --sprot/--download/--wget has been adapted, and an 
error message is shown when attempting to download patches without an 
SSL/HTTPS enabled wget.

The changes won't have an affect on systems which are setup correcly 
already (wget with SSL/HTTPS support, no "ssprot=http" setting 
anywhere). It's just supposed to work correctly in more environments 
without special configuration.

Martin.