Three pull requests:

- Correct fprintf templates to fit no of parameters https://github.com/oe-alliance/aio-grab/pull/12
- Add discriminating number to <Memmapping failed> error messages. https://github.com/oe-alliance/aio-grab/pull/13
- Modify code to prevent sign extensions from "8bit<<24" item messing up 64-bit file-system API use. https://github.com/oe-alliance/aio-grab/pull/14