Updates 1722 structs with ratified names
Adds support for timestamp uncertain flag in 1722
Verify 1722.1 cd length before processing

Prevents trap when dereferencing pointer to struct 
and the packet is smaller than the struct
Fixes random variation of MAAP announce tx times. 

AVnu tests MAAP.c.2.4a, MAAP.c.2.4b
Fixes MAAP compare_MAC function to correct byte reversal

AVnu test MAAP.c.1.1d and others
Marks control arrays as nullable to prevent exception
Move ADP into announce state on init
Talker valid unique returns 0 when Talker is disabled
Fix for build error when Talker is disabled (bug 15374)
Updates README
Merge branch 'plugfest_march14'
Replace check with #if to prevent compile warn
Fix compile error on bad merge