Debugger: Track cache traffic better.
Fix debug state check.
Expose cache tracing as static method.
Track total cache transfer.
Add Cache layer-level in-process caching to prevent wasted trips to memcached.
Store plugin and theme data in APC cache.
Allow disabling of APC caching of plugins and themes.
Default APC usage to FALSE.
Fix divide by zero bug.
Merge branch 'feature/cache' into release/2.1b1

Conflicts:
	applications/dashboard/models/class.usermodel.php
	library/core/class.memcached.php