Added a function to set the offsets of the GPS to the current position in both geodetic and cartesian coordinates.
Added functions to get these offsets.

Solved a bug when double freeing a mutex when a communication timeout occurs.

  - change the estimation dynamics to moderate instead of high.
  - Ignore all satellites except the GPS ones.

Added a small library to convert raw data to PGS navigation data using GPS tool kit.
The compilation of the GPS tool kit modules in conditional on its presence in the system.

Completed the functions to stream the GPS information.
Minor changes to the GPS data types.

Modified the main CMakeLists.txt to set the compiler flags for the C++ compiler instead of the C compiler.
Solved some compilation warnings that appeared.

  This is NOT a working driver yet
  It is being moved from andreu corominas' asterx1 driver to 
  IRI friendly driver