[pca] Patch keeps re-downloading and appending to existing file

[Martin Paul]

> Is anyone else seeing this problem?

Yes, same here. In the debug output you can see that sunsolve announces 
a file of size 68182353, but it delivers only 68182347 bytes. That's why 
wget stalls at 99%, as it waits for the missing 6 bytes. Problem is that 
those don't seem to exist. If you copy 120011-14.tmp to 120011-14.zip in 
a second terminal window while pca/wget is still running, you get a 
valid file ("unzip -t 120011-14.zip" will show).

It seems as if sunsolve does not get the size of the patch file from the 
file itself, but from some other source which is not consistent with the 
actual file. wget (and pca) can't do anything about it - if a web server 
announces a 100 byte file, it must not stop after 99 bytes.

I have no idea what causes this behaviour, but I've seen it in the past 
with different patches, and it always disappeared one or two days later.

Martin.