* Fix angle units for reverse trigonometric functions
* Add a streaming option to capture the output in real-time as a series
of bitmap images
* Switch to Decimal due to the non-continuity of Ent() breaking
assumptions about the fidelity of floats. Trigonometry functions are
still computed as floats.
* Fix the line rendering algorithm for edge cases and add a new test
line-positive.txt that ensures basic patterns are all correct.
* Use custom rules to generate text representation of decimal numbers as
to better match the output of the fx-92.
* Improve the test constants.txt to better evaluate this representation.
The interpreter automatically checks that the representation matches
the value and fails on error to avoid scratching heads.
* Fix EQUAL not being treated as a relational symbol.
The program is currently able to lex most useful tokens, and parse
constructs associated with them on simple examples.
Unit tests are still missing to formally ensure everything's right.
Lephe