For a large number of tests, the resulting .yml could not be interpreted 
by the GitLab ci

use the generator script from the template instead

Changed parameters for linear solver to reduce iterations

Closes #950

See merge request !2570

Math: add a function for linear regression

See merge request !2569

[pnm] Various imrprovements

See merge request !2568

* function doesn't add any value
* use ctor of BasicParams directly

Extend intersection tests for 1d3d

Closes #987

See merge request !2453

[variablesbackend] Generalize vector dofbackend

Closes #1014

See merge request !2564

[fixup][md] Fix parallel check in multidomain assembler

See merge request !2562