MUC: Revert unstable MUC commits since 0.10.1
These have caused too many issue reports to be included in
the stable branch at this time.
Affected issues: #345, #397
Reverted commits:
dcd53a565c01
6d4b0895f76d
1b10802a770e
564e897f0790
a7221ada9368
aaff40ec7001
05a3275b6873
c2b99fa134b3
8da11142fabf