Update CSS to version 7

[surilindur]

Here is a small set of changes to update the CSS version to 7, and to adjust the use of it in code and fix the unit tests. The new configuration has been tested to work when serving the generated dataset and only doing reading (since locking is still disabled, as it was previously).

If there is anything that could or should be changed, I can do that.

[coveralls]

Pull Request Test Coverage Report for Build 8894987796

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 6611244847:	0.0%
Covered Lines:	116
Relevant Lines:	116

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💛 - Coveralls

[rubensworks]

Thanks! Remind me to merge this one once the fragmenter stuff is ready :-)

[surilindur]

This is ready to be merged on its own, I think it would make for a cleaner commit history than adding everything else also in this same PR. Would that be okay?

[rubensworks]

Thanks!