Fix py3 setup

See merge request !23

fix black style

 -make lalsuite-from-pip the default recommendation
 -don't call any packages that are included in the requirements "optional"

 -drop where="pyfstat" from find_packages()
 -fix license file path
 -add descriptions
 -remove pycuda from requirements.txt
 -add lalsuite to both install_requires and requirements.txt
 -refs #17

Gitlab ci runner setup

See merge request !22

- only black for now

- run against pip-installed lalsuite
- use python3 venv

- logged commandline can contain full path to exectable, so
  cmdline-comparison must be agnostic to that
- fixes failing test against pip-installed lalsuite

Make tests more robust

See merge request !21

- fix test that can otherwise fail (observed on MacOSX)

- any import failure should just be treated as such: we can't import
  that module for whatever reason

Use black pep8 codestyle

See merge request !20

Port to python3 and new lalsuite

See merge request !19

- supply consistent flake8 settings in setup.cfg

- adapt to change in lalsuite API (PulsarAmplitudeParams) in aff93c45

- tests currently fail

add pycuda as optional dependency

See merge request GregAshton/PyFstat!17

ephemerides finding improvement

See merge request !18

internal timing of transient F-stat map function

See merge request !16

- Adds chains to saved data
- Add catch for when corner plots error