Initialize constants for all block sizes in init functions.
Remove extraneous README.txt

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>
Removes README.txt from Makefile.am
Add HW encoder functions
Switch to 16 bit filter
Convert int to od_coeff where it makes sense
Fix remaining od_coeff bugs
Merge branch '16bit_coeff' into hw