Parallellized tool installation.

[rhpvorderman]

Well, I think this should be possible. I just spend quite some time installing new tools, it is quite tedious. This will require some refactoring however, and shed-tools testing is not up to scratch yet.

One of the enormous advantages of doing this is that tool installation will also be much faster in the testing, which will save a lot of time.

[bgruening]

Conda does not support parallel installation, left? For containers that might work with some work in Galaxy.

[rhpvorderman]

Ah. conda/conda#5997
Okay. Well, still it is possible, but then the package cache cannot be shared. But that would require some work in galaxy. And arguably a one-hour wait is not that bad in the grand scheme of things.
(As opposed to the waiting we do on the CI for ephemeris. That is quite bad.)