Added projection matrix epsilon that fixes depth clipping issues in some games
Moved projection epsilon to a more reasonable place
DolphinWX: Allow cancelling gcz compression.
DiscIO: Decompress to file using a larger buffer.

This improves performance by around 20% for me, and the memory use impact
is negligible considering Dolphin is otherwise unusable.
DiscIO: Avoid zeroing buffer when compressing gcz.

This saves 6% time.
DiscIO: Change a memset() to zero initialization.
[ARM32] Removes conditional execution from ARMv7's Jit function.
[ARM32] Removes a block of conditional execution in the dispatcher.
[ARM32] Remove conditional execution from store instructions.
D3D: Replaced shader-based depth range remap with viewport

This fixes UI rendering in some games mentioned in https://code.google.com/p/dolphin-emu/issues/detail?id=7785
D3D: Removed somewhat mysterious comment

It would be good to know which games exactly exhibited the issue.
Renamed DEPTHPARAMS to PIXELCENTERCORRECTION

This shader constant was previously used for depth remapping in D3D and for pixel center correction. Now it only serves one purpose and the new name makes it clear.
D3D: Viewport min and max depth is now clamped to [0..1] range
JIT: skip weird fmul rounding if the input is known to be single precision
JIT: minor cleanup, avoid MOVSD where MOVAPD will do

Avoids false dependencies.
JIT: float instruction attribute fixes, fix binding mistakes

These instructions modify only the bottom halves of the output register,
so the output register needs to be treated as an input too.
JIT: more optimizing of float ops based on known input characteristics

If the inputs are both float singles, and the top half is known to be identical
to the bottom half, we can use packed arithmetic instead of scalar to skip
the movddup.

This is slower on a few rather old CPUs, plus the Atom+Silvermont, so detect
Atom and disable it in that case.

Also avoid PPC_FP on stores if we know that the output came from a float op.
JIT: remove unused flag.
VideoCommon: Fix -Wsign-compare warnings.
[ARM32] rlwimix and rlwnmx optimizations.