Merge branch 'feature/ExpFromFile' into 'master'
Expansion from restart file and improved partitioning This MR makes two changes which might be useful for simulations with variable polynomial order: - Allow the expansions to be loaded directly from the field definitions in a restart file (issue #14), using: ```xml <EXPANSIONS> <F FILE="restartfile.fld" /> </EXPANSIONS> ``` This is useful when using DriverAdaptive, since in that case the final distribution of polynomial orders is only available in the field file. - Introduce new options for load balancing in the mesh partitioning, through the solver info `WEIGHTPARTITIONS`. Possible values are `DOF` (load balanced by number of degrees of freedom in each element), `BOUNDARY` (load balanced by number of boundary degrees of freedom in each element) or `BOTH`. By default, the current behaviour of using no weights is maintained. See merge request !617