0.3.0

The most important modifications here are:

1. Implemented SIMD for wavelet and colour transforms, for both the reversible and irreversible paths.
2. Implemented faster trunc and round functions.
3. Fixed a bug in error/warning messaging.

Improvement in speed:

1. Point 1 produced a small improvement in speed.
2. Point 2 produced a decent improvement in speed.
   More speed can be obtained by improving the speed of the block coder, or, for the irreversible path, employing 16-bit arithmetic instead of floats.

Now on an i7-6700:

For irreversible wavelet:
Tested with 4K 4:4:4 image with 8bits depth, using "-qstep 0.007;" this produces a file that has around same size as that produced by JPEG with Q95.
Encoding: 0.27s.
Decoding: 0.22s.

For reversible wavelet:
Same image with lossless compression
Encoding: 0.53s.
Decoding: 0.34s.

0.2.0

Customizable error management has been added.

0.1.1

A few bug fixes. Minor cosmetic modification to code.
Next, we need to improve error reporting.

0.1.0

This is a working release.

But after committing it, I noticed a couple of bugs; one related to progression order, and one small decoding bug. The reason I say they are small, because it is very unlikely you will observe them.