better freq offset estimation and sync, but still has some false sync states, ofdm_mo...

better freq offset estimation and sync, but still has some false sync states, ofdm_mod working with test frames, verbose option for freedv_rx

git-svn-id: https://svn.code.sf.net/p/freetel/code@3585 01035d8c-6547-0410-b346-abe4f91aad63