Merge with 0.7

Merge with 0.6 (into 0.7, namely mod_compression fixes)

mod_compression: Return <setup-failed/> instead of <unsupported-method/> where applicable.

mod_compression: More robust stanza processing.

mod_compression: Don't succeed after indicating a failure.

mod_compression: Don't tell client compression succeeded when it didn't.

mod_compression: Fixed various possible tracebacks in logging.

util.cyrus_sasl: Pass the realm to Cyrus

MUC: Added support for letting clients manage discussion history.

Merge with 0.7 (and indirectly 0.6.2)

(0) -1000 -300 -100 -10 +10 +100 +300 +1000 tip

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