Move test_Message.cpp out to fix Sensorino compilation.
A dirty workaround to make Base compile out of the box.

Apparently when the Arduino IDE starts up it looks over all the
subdirectories in libraries/ and caches all .h files.  If one of the
files is #included from a sketch, the whole directory will be linked
with the sketch's binary.  With Sensorino.h both inside
libraries/Sensorino/ and
libraries/Base,
it would try to compile and link all files in both libraries, causing
duplicate symbol conflicts.
Don't print structError if another error already printed.
Make the big typeinfo struct a const.

This may help the compiler squeeze some more optimization in.
Enable pull-ups on Switch pins.
Switch Sensorino.cpp to our mini-radiohead mock NRF24 library.
Don't disable the NRF24 RX_DR interrupt.
Explicitly switch radiohead to Rx mode just in case.