* Add HAVE_USB to config.mk
- Now is possible to build a usb-less version of the flasher
(only for unpacking and so, offline operations)
* Refactor varname. Avoid portability problems:
- reboot -> moboreboot
- Looks like n770 and n800 have different USB identifiers on the
bootloader and the operating system.
* Print oops message and exit when the use has no permissions to
access to the usb.
pancake