0.9.3 (WIP) Bugfix release

Bugfixes for opcuaShow() and early processing of records - Work-in-Progress

Fixes two bugs introduced in 0.9.0:

• The opcuaShow command was causing segfaults when matching record names under specific conditions (#125).
• OPC UA records that were processed early by other EPICS mechanisms could end up totally blocked (#126).

Updating to release 0.9.3 is recommended for all users.

Thanks to @bkuner for finding and reporting these issues.
As always: please report any additional findings in the issue tracker.