Created separate Makefiles for the receiver and transmitter controllers (microcontrollers).
Removed original Makefile.
Removed #include statements for files that are no longer necessary; in order to simplify this first experience using the nRF24L01+ modules, I'm going to just send simple text messages between transmitter/receiver modules at first. So, I removed include files for the I2C library and the HMC6352 Compass module library.
Rewrote comments at top of file to reflect the fact that this first use of the nRF24L01+ modules will not include the use of the HMC6352 compass or any other peripherals.
Fixed some indentation issues.
Removed some code I'd planned to use with an I2C sensor. I will move that code to another file later.