Dev merge middleware

Created by: ThanKarab

Changelog:

• Big refactoring on the exareme/galaxy algorithm execution.
• One call to get exareme/galaxy algorithms on /algorithms.
• Automatic fetching of the galaxy workflow results (error or not).

Created by: ghost

DeepCode's analysis on #dec1ad found:

• 0 critical issues. 1 warning and 4 minor issues. 0 issues were fixed.

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Created by: nicedexter

Review: Approved

Don't have time to re-read everything, sorry But the sizes of the merge will improve after this refactoring. Just noticed that IMAGE="kkech/portal_backend"

Merged by: nicedexter at 2020-02-27 13:20:52 UTC