Added fractional pixel motion estimation

Added farctional mv support for inter recon

Added 1/8-pel chroma and 1/4-pel luma interpolation
Added few warnings to Makefile

Cleaned fme code a bit
Fixed cost calculations in fme
Merge branch 'fme'
Added --subme commandline parameter for fractional pixel motion estimation: 1 == enable (default), 0 == disable.
Merge branch 'fme_merge'