wiki: how to build a conda package that depends on uvcdat

[stefraynaud]

An wiki entry on this subject would be nice.

I successfully built the last version of uvcdat following the wiki guidelines:

conda create -y -n uvcdat-test -c uvcdat -c conda-forge uvcda

However, I have not been able to pass the final test when building vacumm with:

conda build -c vacumm -c uvcdat -c conda-forge vacumm

It fails when importing MV2 (ImportError: libjpeg.so.9) with the same message as when I was trying to install uvcdat without specifying channels from the commandline (only in .condarc).

[stefraynaud]

I found that installing the pil package along with uvcdat is responsible for the libjpeg error.