- Fix -data-list-register-names command: previously it ignored regno arguments and always showed all registers
- Add 'size' field to -data-disassemble command: now we are able to get an instruction's size
- Minor fix in -data-list-register-value: fix comments/code style
- Enable all tests in MiDataTestCase
- Fix the GetRegister function that gets an register by its index
These changes were tested on OS X; all MiDataTestCase tests were passed.