Release 2.03.02

Bugfix release.

Among other things, this resolves following issues:

* Fix (de)activation of RaidLVs with visible SubLVs,
* Prohibit mirrored 'mirror' log via lvcreate and lvconvert,
* Use sync io if async io_setup fails, or use_aio=0 is set in config,
* Fix libdevmapper-event library linking.
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