Contains documentation updates and bug fixes

Merge pull request #288 from jepler/fix-stubs

frombuffer: Add type declarations to stubs

adds frombuffer and fixes diff code

1.7.0

added frombuffer stub

adding a set of new functions and features to version 1.1

Compared to the latest release, this version adds

• Boolean initialisation option
• nan/inf class level constants
• dtype function/method/property
• median function

and

• removes size from linalg

complete re-work of code

This release is a complete re-work of underlying code, while the API is mostly unchanged.

Features added:

    support for tensors of rank 4
    broadcasting
    views
    in-place operators
    customisation via a single header file (ulab.h)
    numpy-compatibility for functions, where it makes sense

Functions/methods added

    .tobytes()
    concatenate
    cross
    full
    logspace
    diagonal function

slice indices raise CPython-compatible exceptions now

Merge pull request #186 from jepler/ci-circuitpython

Build circuitpython-ulab as part of CI

0.54: Merge pull request #151 from v923z/docs

Added the trapz, arange, and norm functions, and integrated the documentation into source code.

extended the filter sub-module, fixed smaller bugs

Merge pull request #130 from v923z/argmin-fix

fixed argmin/argmax error in issue #129

0.50.2

Merge pull request #125 from v923z/openmv-fix

fixes compilation error in openmv

0.36.0: Merge pull request #54 from v923z/readme

updated readme

firmware for pyboard v.1.1, PYBD_SF6

Merge pull request #5 from v923z/testing

Testing