issue-#138 Support for files larger than 2Gb

[Robert]

For the issue see : https://redmine.blackboxframework.org/issues/138
For the discussion see: viewtopic.php?f=41&t=540
For the diffs see: https: https://redmine.blackboxframework.org/p ... 729f9239c9

This is an important, if not vital, facility, so I hope you can support it.
I have been using such a feature (with a proprietary implementation) nearly every day since 2002.

(I have not personally tested this implementation, has anyone else?)

[Robert]

Vote passed.