[C#] Recovery improvements #330
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* Allow calling recover multple times with newer hlog checkpoints * Fix bug in index fast-forward when using snapshot checkpoints with separate index checkpoints
* Avoid rescanning the log during recovery - only single scan of the log is now needed * Only write back pages that have records that need to be marked as Invalid
… it should remain as mutable unpersisted state.
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This PR significantly speeds up recovery (from checkpoint), which is important in several scenarios.