Fixed CORE-4371: Create function/sp which references to non-existent exception: error message is "Error while parsing function's BLR" instead of "exception not defined".

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59313 65644016-39b1-43b1-bf79-96bc8fe82c15
Cleanup.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59314 65644016-39b1-43b1-bf79-96bc8fe82c15
Allowed conditional bitmap scans for the index navigation.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59315 65644016-39b1-43b1-bf79-96bc8fe82c15