In this commit, support for the different base addresses for different
F7 parts is added, but the mechanism is now in place for L1 and others.
Reviewed-by: Karl Palsson <karlp@tweak.net.au>
(whitespace fixed, commit msg reworded)
Most changes are noise from doxygen.
Readme udpated to explain newer FP_FLAGS for m7
stm32f7 library is skipped if the toolchain doesn't support it yet.