Fix incorrect check for missing '-w'
.gitignore for SCons generated files
Implement preprocess_tb() in AVX2

Fix missing 16-bit register declaration in x86inc.asm.
Lift one RET statement per function limitation from x86inc.asm.
Add SSD 4x4,8x8,16x16,32x32,64x64 in AVX2

Calls to optimized distortion functions in analyze.c
Add support for faster non-bit-exact C code
Add credits file
Fix TB size normalization error
Add support to display assembly architecture
Add call to optimized function in me.c
Use precomputed MV costs
Bugfix parameter parsing for 'algo'
Merged lost HM-compatiblity patch.

Patch got lost during repository server crash.
Increase maximum MV range
Fix compilation issues on OSX
Fix RMD 4x4 block offsets
Tile-based multithreading
Add -pthread for UNIX build