Removed unused rule, in case it's needed later adding it once again is trivial

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60094 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed bug CORE-4575 : AV in garbage collector thread at disconnect of last attachment

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60095 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed bug CORE-4576 :  Cache Writer thread could not start

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60096 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed AV caused by one of my recent commits - thanks to Vlad

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60097 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed CORE-4574 - Incorrect result in subquery with aggregate.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@60098 65644016-39b1-43b1-bf79-96bc8fe82c15