Some cleaning tasks

[sbacchio]

@sy3394 here a list of some tasks for the cleaning branch:

• run lyncs_pylint and try to solve most comments as possible (addressed by Cleanup2 #15)
• fix the pylint workflow that currently is failing (see lyncs_utils for reference) (addressed by Cleanup2 #15)
• fix also the budges in the README
• would be nice to use enums.py more systematically in the package (I believe I used it in few places) (addressed by Cleanup #14)
• write a patch for using std::exception in errorQuda (addressed by Cleanup2 #15)
• subclassing ndarray (addressed by subclassing ndarray #12)