Cache quota is now restricted to available disk space

Description

Restricts cache quota based on system resources.

Changes proposed in this merge request:

• Check the cache quota configuration and bail out if it is too low.

This merge request, when approved, will close issue/bug: #491 (closed)

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mentioned in issue #497 (closed)

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A test for this would be ideal, but currently a bit painful to write.

I'm happy merging this, caveat that we also change the warning message if the user specifies a cache size of < 2GB. Not to avoid documenting this (we should certainly at least mention the 2GB space requirement, even if we find the headroom feature too confusing to explain), but to avoid confusing a poor user who doesn't read the documentation.

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