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Add Interior Penalty method to DG framework

See merge request !1101

- Renamed some `_` functions, e.g. `GetFwdBwdTracePhys_serial` -> `GetFwdBwdTracePhysSerial`.
- Applied whitespace corrections to a number of files
- Ran new files (DiffusionIP.{c,h}) through clang-format.
- Corrected some typos in function names inside `LocTraceToTraceMap`.

Updates to support 3D geo file format

See merge request !1031

Fix/real comparison

Closes #202

See merge request !1134

Windows 10 MPI build support

See merge request !1143

Fix/interppoints_3DH1D

See merge request !1140

master now includes changes from !1112 so merging this into the win10mpi
changes to test and simply subsequent merge of !1143.

Create new MPI communication routines for DG implementation

See merge request !1112

Update CI to ensure compiler warnings are run with correct image

See merge request !1141

Add macro for deprecation of num_elements()

See merge request !1137