Implement improvement CORE-4451 : Allow output to trace explain plan form
New boolean setting was added into fbtrace.conf: explain_plan.
See also comments at fbtrace.conf nearby explain_plan.


git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59698 65644016-39b1-43b1-bf79-96bc8fe82c15
Fixed CORE-4417 - gbak: cannot commit index ; primary key with german umlaut.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/trunk@59699 65644016-39b1-43b1-bf79-96bc8fe82c15