Add -1/(q_e n_e) factor to collisional drag term.
David Dickinson
Branch: bugfix/add_missing_factor_in_collisional_drag
Branch: bugfix/cyclone_test_different_normalisations
Merged
Merged pull request
Merged in bugfix/add_missing_factor_in_collisional_drag (pull request #593)
An attempt to address comment noting 1/(n_i q_i) factor missing. The electron values are chosen to attempt to deal with the multi-ion species case. This change fixes the failing collisional normalisation tests