Improve header skipping check in .xcfg load

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Remove unintended debugging code

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Make --verbose 1 output warnings

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Do not write zeros to locations not specified in .xcfg file

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Do not write zeros to object bytes not specified in OBP_RAW file

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>