more adding TS to ex3

added q/m

added v x B term

started ex3 with TS

added ex3 - vlasov-poisson

Merge branch 'barry/clarify-dmplex-documentation' [PR #917]

* barry/clarify-dmplex-documentation:
Rename DM[GS]etDefault{Global}Section() to DM[GS]et{Global}Section().
Add DMPlexComputeGeometryFEM()

swarm ex2: increased default moment tolerance 1 order of magnitude

ex2: added 3d tests with associated outputs

ex2.c: changes made to alter pc type for 2 faces proj and tri. cleaned up output directory

ex2.c: needed to use lu PC type for 2 faces in tri and quad

transpose particle mass/Q matrix to fix parallel

Merge branch 'jpustay/feature-swarm-example' of bitbucket.org:jpusztay/petsc into jpustay-rem/feature-swarm-example

# By josephpusztay
# Via josephpusztay
* 'jpustay/feature-swarm-example' of bitbuc

Merge branch 'jpustay/feature-swarm-example' of bitbucket.org:jpusztay/petsc into jpustay-rem/feature-swarm-example

# By josephpusztay
# Via josephpusztay
* 'jpustay/feature-swarm-example' of bitbucket.org:jpusztay/petsc:
add 3d tests and pull in marks code
add 3d test

Conflicts:
src/dm/impls/swarm/examples/tests/ex2.c

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Swarm ex2: Lots of code cleanup
- Added tests and automatic checking

DMSwarm: Remove debugging print

Merge branch 'jpustay/feature-swarm-example' of https://bitbucket.org/Jpusztay/petsc into jpustay/feature-swarm-example

add 3d tests and pull in marks code

add 3d test

commiting makefile for debugging

fixed a bug and changed a name

fixed simplex bug

small fixes

fixed bug in test

added support for periodic

mem bug

added domain geometry and vertex perturbation