Separate `differentiation_operator` into individual matrices

[ranocha]

In GitLab by @sloede on Mar 10, 2020, 14:38

Separate differentiation_matrix into individual matrices and keep all matrices around all the time (i.e., D, Dhat, Dsplit)

[ranocha]

In GitLab by @sloede on Mar 10, 2020, 14:39

created merge request !3 to address this issue

[ranocha]

In GitLab by @sloede on Mar 10, 2020, 14:39

mentioned in merge request !3

[ranocha]

In GitLab by @sloede on Mar 12, 2020, 11:59

closed via merge request !3

[ranocha]

In GitLab by @sloede on Mar 12, 2020, 11:59

mentioned in commit bac02f1