Site updates - March 2012

Added a FAQ about IDs and DOMES of Master Beacons (see also dorismail 805).

Updated version of 59 sitelogs. The source of coordinates and velocities is ITRF2008 or DPOD2008 (see also dorismail 790).

Added 4 maps of visibilty circles for Cryosat-2 and HY-2A

Updated the Documents page (See Space segment) with data and documents related to the DORIS/HY-2A mission:
-Added links to the maneuver and mass files
-Updated information about HY-2A in the table "COSPAR numbers, Launch and Orbital information"