[pca] pca --update downgrades dev version

[Martin Paul]

Hi,

> I suppose you don't want to make too many deviations between
> the develop version and the stable version, do you?

Correct. With any stable release, stable and development are exactly the 
same. The development version then starts to differ, until a new stable 
version is released and the two releases are the same again.

> Am I right in assuming, that this is (one of) the reason, why pcaurl is the
> same in the script you ship as stable and develop?

Half-right. The other half is that I simply never thought of the 
possibility to use a different pcaurl in the two releases :) It makes 
sense, in a way. On the other hand, I know of people who normally only 
use the stable version and only temporarily run one certain development 
release for a fix they need. For those it still makes sense to have 
pcaurl set to the release channel. Otherwise they will suddenly start to 
follow the development channel.

> I'm rather unsure if I'd want to ask/suggest that pcaurl should
> differ in those 2 script versions of yours.

I think it's a good idea, but I'm unsure as well. Besides the above 
change in behaviour, I'd have to get some procedure in place to ensure 
the correct setting of pcaurl in the two releases. This is especially 
problematic during the time windows where stable and development release 
are the same, as they are really links to the same file as of now.

Thanks,

Martin.