added ex4 and 5 proper test outputs

ex4.c: cleanup

ex5: added traingle to test requirements

Merge branch 'master' into jpusztay/feature-swarm-symplectic-example

Merge branch 'master' into jpusztay/feature-swarm-symplectic-example

ex4: cleaned up and formatted outputs

Fixes to ex5

Added SP context to TS and implemented swarm monitor

Swarm ex2: Updated to new interface

ex5: update residual velocity equations/initial conditions

Updated velocity equation

ex4: update indices for scaling

ex5: updated indexing, encountered bug in TS

ex5: Fixed loop indexing bug

ex5: spawns a swarm with tsbasic symplectic to check gravity. TODO: implement proper initial conditions

Swarm ex2: Fixed memory allocation for temporary hh array.

fix clang static-analyzer warning

/sandbox/petsc/petsc.next/src/dm/impls/swarm/examples/tests/ex2.c:148:106: warning: The right operand of '*' is a garbage value
coord[d] = PetscMax(user->doma

fix clang static-analyzer warning

/sandbox/petsc/petsc.next/src/dm/impls/swarm/examples/tests/ex2.c:148:106: warning: The right operand of '*' is a garbage value
coord[d] = PetscMax(user->domain_lo[d], PetscMin(user->domain_hi[d], PetscRealPart(coord[d] + value*hh[d])));
^~~~~~

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Swarm ex2: Reduced sensitivity to round-off errors and system-specifics.

Swarm ex2: Removed code line with no effect.

Swarm ex2: No longer printing round-off errors.

This makes the nightly tests much more stable.

Swarm ex2: Added alternative test output.

Revert "Swarm ex2: Trying to fix an out-of-bounds error."

This reverts commit 29d9ce0107da9c91ce3e02fe0d776c1fc8399446.

Swarm ex2: Fixing potentially uninitialized variable.

Reported by the clang static analyzer.

Swarm ex2: Trying to fix an out-of-bounds error.

Reported by the clang static analyzer.

Swarm ex2: Tests now require !complex.