two changes:
* tweaked auto tuner logic with regards to high memory usage by indexing
* fixed issue with compression in Esent - SerializedSizeOnDisk was receiving compressed document size --> changed so it receives decompressed document size
* tweaked GetDocsFromBatchWithPossibleDuplicates so it won't grow prefetchingQueue larger than threshold
Merge branch '2.5' of github.com:ayende/ravendb into prefetcher-tweak-large-docs
during backup memory-only index will be written to disk - so its data persits between backups
Merge branch '2.5' of github.com:ayende/ravendb into prefetcher-tweak-large-docs
issue 2239 fix for 2.5
test changed
Merge branch 'prefetcher-tweak-large-docs' of https://github.com/myarichuk/ravendb