Do not include occupied bootloader space in maximum_size

[MCUdude]

The default maximum_size field should instead reflect the total amount of flash memory the microcontroller has regardless if the user has loaded a bootloader or not. #207 related.

The actual bootloader size (512 or 1024 bytes depending on target) should instead be subtracted from maximum_size if board_hardware.uart != no_bootloader

[MCUdude]

@valeros does it look OK? Anything you want me to change?

[valeros]

All good, many thanks!