No-Numba mode

[maurosilber]

Can we replace NBKODE_NONUMBA=0 with NUMBA_DISABLE_JIT=0? Or are we doing something more?

NUMBA_DISABLE_JIT
Disable JIT compilation entirely. The jit() decorator acts as if it performs no operation, and the invocation of decorated functions calls the original Python function instead of a compiled version. This can be useful if you want to run the Python debugger over your code.

[hgrecco]

The main difference is that using NBKODE_NONUMBA allows running numbakit-ode without having numba installed. This is certainly debatable (it is called numbakit after all). But my feeling is the cost is small (an environment variable and a compatibility module).