Fix possible crash related to JAB caret events.

If a JAB caret event is mapped to a focus event, don't try to map it to a caret event as well, as this will eventually cause the accContext to be released twice.
Re #3177.
Fix a problem which sometimes occurred when connecting to or pressing keys on Papenmeier BRAILLEX newer models.

This was caused by an indentation error.
Fixes #3174.
Merge branch 'release-2013.1' of git://git.nvaccess.org/nvda into release-2013.1jp