Replaced macro FB_ALIGN with function fbAlign, minor related cleanup

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59905 65644016-39b1-43b1-bf79-96bc8fe82c15
Correction

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59906 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed CORE-4498: FB 3.0 crashes when getting an explained plan for a DBKEY based retrieval.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59907 65644016-39b1-43b1-bf79-96bc8fe82c15