Some more changes to the API documentation.
Musl now uses '<>' as the not-equals operator.
The POP() function can now take the name of a variable to pop to as argument.
The THROW() function's argument is now optional.
The INPUT() and INPUT$() functions are now separate, with slight differences in their behaviours.
Fixed a couple of tests that were broken because of recent changes.
The THROW function has now been renamed to ABORT. It's more BASICy
Added a .gitignore file
Added another minor test.