Simplest solution for CORE-4386: Report more details for "object in use" errors. Also, I've removed the database filename from the error message for security reasons. v3 is going to get a more complete solution.

git-svn-id: svn+ssh://svn.code.sf.net/p/firebird/code/firebird/branches/B2_5_Release@59369 65644016-39b1-43b1-bf79-96bc8fe82c15