Improve test coverage for latex_codec module: trivial functions missed earlier, better splitting so incremental decoder/encoder must use state.
Test for type errors.
Test invalid codes.
Fix error handling of unknown unicode points.
Fix Python 3 bytes splitting.
Better fix for split, using slices.
Test fixes for Python 2.6.
Check getstate and setstate of incremental decoder.
Fix incremental decoder constructor.
Test different types of errors.
Also test bad error code.
Merge pull request #21 from mcmtroffaes/feature/latex_codec_coverage

Improve latex codec test coverage.