Don't keep MetaSource around in Source

Description

We can rebuild MetaSources easily, there is no need to keep them around. Let's save memory.

Changes proposed in this merge request:

• Don't store MetaSources in sources

This merge request, when approved, will close:

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added 3 commits

• ecc30f17...868c057e - 2 commits from branch master
• ace15fa6 - Don't keep MetaSource around in Source

Compare with previous version

Looks good to me !

enabled an automatic merge when the pipeline for ace15fa6 succeeds

merged

mentioned in commit 174f5394