Enhanced diagnostics in authentication mapping

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59452 65644016-39b1-43b1-bf79-96bc8fe82c15
cleanup comments

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59453 65644016-39b1-43b1-bf79-96bc8fe82c15
cleanup comments

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59454 65644016-39b1-43b1-bf79-96bc8fe82c15
cleanup comments

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59455 65644016-39b1-43b1-bf79-96bc8fe82c15