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Turn RangeID into a non-static Cassandra column (#293)

We observed that when executing CAS queries on static fields, the coordinator issues a range query during the read phase of paxos with LIMIT 1.
This is problematic, as it causes table scans when only a point query is needed.
This change turns RangeID into a non-static column to avoid this problem.

This change also reverts the gc_grace_seconds setting back to default 10 days to avoid masking similar issues by fast removal of tombstones.
Issue #277

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10245 of 15176 relevant lines covered (67.51%)

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