Working on squash.
Fix read workload regression.
Squashing seems to be working for everything except limit changefeeds.
Rename server_name_* to server_config_*.
Removed file_account_t argument from index_write.
Make it possible to adjust cache_size dynamically. Not tested yet.
Squash for limit changefeeds.
Fix bug.
Removed dead function.
Update test scripts to check cache_size_mb in table_config.
Update mk/README.md
Use a common file account for block writes in the merger serializer to improve write I/O efficiency.
Merge branch 'next' into daniel_3377
Merge branch 'mlucy_3354' into next
Merge branch 'daniel_3377' into next
Disable OS' read-ahead when using buffered i/o on Linux.
Disable read-ahead on OS X as well.
Revert "Disable read-ahead on OS X as well."

This reverts commit 3cb0b7fa57cb7b24fd38c63c269a025d4719fd54.
Disable read-ahead on OS X as well.
Minor performance improvements.