bug fix for 2419869. also included 2 unittests.

bug fix for 2419869 is the following
   1. only one object can use the prepared statement object
        (SQLiteCompiledSql in SQLIteProgram)
   2. if two objects are requesting to use it, then create a new prepared
      statement object for exclusive use by the newcomer and let it be
      be finalized by the newcomer.
   3. add mInUse flag to SQLiteCompiledSql - to be set when SQLiteProgram
      requests it and to be released when that SQLiteProgram is done with it
a couple more changes included are
  1. unitests to simulate bug # 2419869 (and the fix's repair to it)
  2. better logging in SQLiteCloseable when it prints log messages