Remove vcs dependencies

[lee1043]

Remove dependencies to vcs of CDAT because it is planned to be no longer maintained.

[lee1043]

In my attempt to replace vcs by cartopy, followings were noticed (leaving for documenting).

• @msahn and I have observed some conflict in conda env that prevents installing cartopy in the PMP-installed conda env. As a workaround, @msahn has used basemap in his plotting work, but basemap is no longer maintained and supposed to be replaced by cartopy.
• I think I found where the conflict was caused: proj4 and cartopy, specifically proj that is one of dependencies of cartopy.
• I don't see proj4 explicitly used in PMP. Plus, proj is supposed to replace proj4 according to this doc.
• So I think it is okay to remove proj4 and add cartopy in dev.yml.

@gleckler1 @acordonez I don't think I've seen any code that use proj4, have you seen/used it in any code of PMP?

In @tomvothecoder's PR the proj4 was included because it was listed in meta.yaml.in from here: https://github.com/PCMDI/pcmdi_metrics/blob/8993d51c23cf8dd7abcc418acc5bbc8ef90fe645/recipe/meta.yaml.in. Is that correct?

[acordonez]

@lee1043 I haven't seen proj4 explicitly imported. I'm guessing it was a dependency for something else.

[tomvothecoder]

In @tomvothecoder's PR the proj4 was included because it was listed in meta.yaml.in from here: https://github.com/PCMDI/pcmdi_metrics/blob/8993d51c23cf8dd7abcc418acc5bbc8ef90fe645/recipe/meta.yaml.in. Is that correct?

Correct, proj4 was in the old meta.yaml.in so it was copied over.

In my attempt to replace vcs by cartopy, followings were noticed (leaving for documenting).

• @msahn and I have observed some conflict in conda env that prevents installing cartopy in the PMP-installed conda env. As a workaround, @msahn has used basemap in his plotting work, but basemap is no longer maintained and supposed to be replaced by cartopy.
• I think I found where the conflict was caused: proj4 and cartopy, specifically proj that is one of dependencies of cartopy.
• I don't see proj4 explicitly used in PMP. Plus, proj is supposed to replace proj4 according to this doc.
• So I think it is okay to remove proj4 and add cartopy in dev.yml.

Based on your findings, I will

• Add cartopy to the dev.yml and resolve package conflicts (remove proj4) #789

Related to PR #790