add easyblock for RELION

[lexming]

Depends on #2280 and #2302

Easyconfig in easybuilders/easybuild-easyconfigs#10965

[migueldiascosta]

@lexming it seems #2280 was not enough, there's a similar code block in test/easyblocks/module.py

[lexming]

@migueldiascosta fix for those tests in #2302

[lexming]

Successful test report in easybuilders/easybuild-easyconfigs#10965 (comment)

[JackPerdue]

It might be useful to split out the part concerning batch/queue systems (i.e. Slurm/Torque/LSF(?)) and their particulars to its own easyblock for use by others that might want to use it. I don't know what the EB framework uses for when it uses jobs to build things (I've always just built on the login nodes), but it might be able to use it too. Just a thought.

[dithwick]

Two other quick thoughts (although maybe best for a later update):

• ALTCPU=ON should only be enabled when TBB is in the dependency chain, maybe it's worth detecting this (although I note the corresponding easyconfig does have this).
• MKLFFT=ON maybe should be added when MKL is detected.

[shahpnmlab]

Line 171, results in a str float comparison which is not valid.