Made adjustments in the dsgamma-test entrypoint.
Added possibility to change the rate and the minumin numbero of chars for the writing thread of the gamma868 object.

Added some comments and deleted some debug printf in gamma868 related files.
Added the possibility to send only after a certain number of bytes is in the buffer.

Add config.h configuration header with various constants.
Add a circular buffer with fixed dimension in Gamma868.cpp and 
make send() non-blocking: data is put in the buffer and read in a second moment.
Add a start() method which starts the thread that continuously looks in the buffer
and sends what it founds

There is still one bug that causes immediate stack oveflow if PKT_LEN is greater than 24

There are still some problems on reading, and sometimes it goes in stack overflow.

We discovered that the real name is gamma868, so this will be the name of the object.
Added a simple communication test that works on 2 discovery boards, (1 gamma each).

We discovered that the real name is gamma868, so this will be the name of the object.
Added a simple communication test that works on 2 discovery boards, (1 gamma each).

Changed the name of the file to dsgamma-config.
Added configuration read and write capabilities: the program enters learn mode and receives the new configuration via default usart.

Found duplicate class with subtle differences, both used at the same time, added fixme to remind to fix this later