Issue 1048 reformat landesfeind electrolyte

[brosaplanella]

Description

Reformatted the Landesfeind electrolyte parameters so now they can be called directly by setting "electrolyte": "lipf6_EC_EMC_3_7_Landesfeind2019" (or similar).

Fixes #1048

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[valentinsulzer]

@ferranbrosa can you merge develop into your branch, this should fix the tests

[brosaplanella]

All fixed now!