Issue #1261846 by catch, dawehner, brianV, Berdir, sun, xjm, sandipmkhairnar, marvil07, chrisjlee, Cottser, amitgoyal, Elijah Lynn, er.pushpinderrana: Document 1 MB cache limit in cache functions

Issue #238250 by markpavlitski | Xano: Fixed cache_clear_all()('*', 'block', TRUE); will TRUNCATE the {block} table without additional checks.

Issue #1015946 by pillarsdotnet, catch, bfroehle, Jej, jose.guevara, Damien Tournoud: Fixed Eliminate ->cache and {session}.cache in favor of ['cache_expiration()'][].

- Patch #692044 by Damien Tournoud, effulgentsia: a site with statistics module enabled is much slower in serving cached pages in D7 than in D6.

- Patch #325169 by mundanity, Arancaytar, Crell, chx, picco, alexw: move error/exception handler higher up in the bootstrap process.

#333171 by catch: Provide cache_get_multiple() and allow clearing of multiple cache IDs at once (with tests).