[plotter] add a --mockup option to the demo main function

[plotter] use OSError instead of more specific SerialException

[test] kill old useless test

[test] add a conftest.py file with fixtures for prologix emulator setup in tests

[prologix] small fix in the prologix emulator

[plotter] flake8

[doc/logo] improved logo

[prologix] implement more prologix commands and add API to register emulated devices

also refactor tests as generative tests using pytest's parametrized API.

[prologix] beginning of a proper prologix dongle emulator

[doc] better icon

[prologix] flake8

[plotter] fix and improve a bit the HPGL plotter emulator

at least, the mocked version now works again

add an .hgignore file

[readme] rename as README.rst

to make bitbucker happier

[doc] refactor a bit the doc and use classic theme

[readme] write a more meaningful README file

[setup] improve setup a bit

- comment section
- include descriptions
- add several setup() args

convert doc to sphinx

project moved to bitbucket

[HP3562A] replace matplotlib with pytgraph