Add an in-memory cache for get_event in the storage layer

Factor out some of the common homeserver setup code

setup_test_homeserver function in utils.

Single source version and dependencies

Single source version and python dependencies, prevent people accidentally installing with easy_install, use scripts rather than entry_points to install synctl

Hotfixes v0.6.1f

Add performance counters for different stages of loading events

During room intial sync, only calculate current state once.

Transaction counters

txn names