fix for creating backup files in dbchecker

git-svn-id: http://svn.miranda-ng.org/main/trunk@7906 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
more accurate control of mmap modes/access

git-svn-id: http://svn.miranda-ng.org/main/trunk@7907 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
не п-п-пригоди-и-илась

git-svn-id: http://svn.miranda-ng.org/main/trunk@7908 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c