* adding scipy integrate, initial check-in
* compile unix double-precision, select integrations algos
* bumping ulab version number to 6.7.0
* adding documentation
* documentation fix
* documentation fix
* documentation fix
* rewritten in some places
* complex number error handling
* added test cases
* resolved importing scipy.integrate
* resolved importing scipy.integrate #2
* build integrate only when we have MICROPY_FLOAT_IMPL_DOUBLE
* reverting commit a4c0c0b
* re-pushing failed commit
* Revert "re-pushing failed commit"
This reverts commit a10e89fe14.
* improve tests using math.isclose()
* enabled fp32 builds
* removed conditional includes
* adapted to new function names, corrected importing
* function names similar to in CPython scipy.integrate, some minor corrections
* major rewrite representing the name changes, mapping to CPython scipy.integrate, more background info
