Implement R2 trimming in single barcode mode
[docs] add very bad first attempt at some docs
[docs] spellcheck, and add usage
[docs/conf] use pngmath, not mathjax
[docs/CMakeLists] Add cmake doc builder
[docs/usage] add usage as extra file & include
[CML.txt] add docs dir to cmake
[tests/cmake] Add cmake coverage target
[travis] add coverage build
[CMakeLists] Don't force build type to Debug
[test/CML] fix up test setup & names

Make a custom target for copying the files over to bin dir