Use a static variable to count instead of machine time for simulation time intervals when using VELOCIraptor

Fix stars unit test

See merge request !620

Updated enum names for VELOCIraptor output.

See merge request !621

Star density

See merge request !581

Merge branch '465-separate-the-hand-written-vectorization-and-the-auto-vectorization-flags' into 'master'

Resolve "Separate the hand-written vectorization and the auto-vectorization flags"

Closes #465

See merge request !617

Trim trailing space from line before parsing it.

Closes #463

See merge request !619

Update task dependency with nber link

See merge request !616

Fixed typo in the documentation that describes the initial conditions

See merge request !618

Include the integer min and max limits in partition.c and activate their usage in C++ via macro definition.

Merged gravity M-M tasks

See merge request !606

Moved the check of negative flags for hydro pairs to the debug code. That never happens in real life code.