removing a bunch of old unused directories

git-svn-id: https://svn.code.sf.net/p/freetel/code/codec2-dev@1720 01035d8c-6547-0410-b346-abe4f91aad63
normalised fine freq error so it wont be dependant on rx levels

git-svn-id: https://svn.code.sf.net/p/freetel/code/codec2-dev@1721 01035d8c-6547-0410-b346-abe4f91aad63
converted trig functions to single prec floats to play happily on the STM32F4

git-svn-id: https://svn.code.sf.net/p/freetel/code/codec2-dev@1722 01035d8c-6547-0410-b346-abe4f91aad63