Cleanup comments and unused code 



git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@57911 65644016-39b1-43b1-bf79-96bc8fe82c15
Remove unused and broken code defined with PIGGYBACK


git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@57912 65644016-39b1-43b1-bf79-96bc8fe82c15