SPI works (bit banging it).
Adding linking command for bcm library.
Adding support for SIGKILL signal.

	modified:   src/pip_sense_layer.cpp
Merge branch 'libusb1.0' (adding support for SIGKILL)
Fixing pip packet structure.

	modified:   src/pip_sense_layer.cpp
Data transfer is okay and faster, not decoding variable length packets.

	modified:   src/pip_sense_layer.cpp
Putting SPI into a different header and source file.
Working at a slow frequency.
Making SPI bus speed choice clear.

	modified:   src/spi.cpp
Saving simple ncurses work.
Working version for display. No recording.
Adding recording functionality.
Adjusting status messages.
Adjusting input time to reduce dropped packets.
Saving work on interval confidence.
Finished work on interval detection.

* Improved accuracy of packet timing by reducing ncurses input delay.
* Everything fits in 79 columns.
Adding PgUp, PgDn, Home, End navigation keys

* Coloring battery voltage.
Adjusting battery display
Fixing battery value alignment.
Fixing uninitialized struct