Fixed CORE-4461: nbackup prints error messages to stdout instead stderr

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59710 65644016-39b1-43b1-bf79-96bc8fe82c15
Documentation for CORE-4403 - Allow referencing cursors as record variables in PSQL.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59712 65644016-39b1-43b1-bf79-96bc8fe82c15