This fixes links to RFNoC docs in the "Coding to the API" section.
* multi_usrp, multi_usrp_clock, and associated classes accessible through C * Added Doxygen documentation explaining structure and API * Simple RX and TX streaming examples * Unit tests for different parts of C interface and C++ error conversion
* Updated manual URL on OctoClock documentation after manual overhaul * Improved "Coding to the API" page