New targets:
- make blupd_all_clean
- make blupd_all
- make blupd_openpilot
- make blupd_ahrs
- make blupd_coptercontrol
- make blupd_pipxtreme
These targets are also included in the 'all_flight' target.
New naming convention for the linker files:
link_(board_name)_(density)_(bl usage).ld
git-svn-id: svn://svn.openpilot.org/OpenPilot/trunk@2401 ebee16cc-31ac-478f-84a7-5cbb03baadba