DMSwarm: remove unneded inclusion of petsc.h that was triggering recompilation when any of petscts.h etc was modified

fix compile warning
/sandbox/petsc/petsc.clone-3/src/dm/impls/swarm/swarmpic_da.c:33:26: warning: ‘npoints’ may be used uninitialized in this function [-Wmaybe-uninitialized]

Fixed potential C89 compilation issues in code which might come into use upon user testing

Fixed C89 compilation errors (C++ comments, comma at end of enumerator)

http://ftp.mcs.anl.gov/pub/petsc/nightlylogs/archive/2017/07/25/make_next_arch-linux-c89_el6.log

DMSwarm complex build:
* Bug fixes for --with-scalar-type=complex

DMSwarmPIC_DA and demo:
* Incorporate API changes to PetscDTGaussTensorQuadrature() and PetscQuadratureGetData()

DMSwarm:
* Add a copy point method

DMSwarmPIC point layout:
* Fixed static memory allocation bug

DMSwarm: Fixes for __float128

DMSwarmPIC:
* Code fixes for complex builds

SwarmPIC bug fixes:
* Must use a consistent comm on the pos vectors and the star forest object. Require PETSC_COMM_SELF for local point location

DMSwarm migrate:
* Initialise a cellSF with cell owners prior to calling the PointLocation method

DMSwarmPIC project:
* Added API for the swarm field projection
* Cleaned up prototype definitions

DMSwarm project (PLEX):
* Added support for basic projection of particle data to the cell dm of type PLEX
* Likely there is some redundant code in here which code be replaced by something in the PLEX

DMSwarm project (PLEX):
* Added support for basic projection of particle data to the cell dm of type PLEX
* Likely there is some redundant code in here which code be replaced by something in the PLEX core
* This code is ugly

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DMSwarm project (DA):
* Added support for basic projection of particle data to the cell dm
* This only works for regular DAs (constant dx and constant dy, but dx != dy)

DMSwarm migrate:
* Copy the values from the star-forest node list into the swarm field cellId.

DMSwarmPIC layout:
* Add subdivision method for DAs

DMSwarm migrate:
* Bug fix - require special removal stage in serial to delete points which left the domain

DMSwarm migrate: Updates for DMSwarmMigrate_CellDMScatter
* Removed the broken code
* Depreciated the variant which performs two full point locations on all npoints (before migration) and npoints+npo

DMSwarm migrate: Updates for DMSwarmMigrate_CellDMScatter
* Removed the broken code
* Depreciated the variant which performs two full point locations on all npoints (before migration) and npoints+npoints_recv (post migration)
* Added variant which performs point locations on all npoints (before migration) and then only on npoints_recv (post migration)

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DMSwarmPIC SetCoordinates:
* Fixed two bugs
* (bug 1) Catch special case when you specify 1 point in a coordinate direction
* (bug 2) Allocate space for dim*npoints coordinates (not just npoints)

DMSwarmPIC point counting utils:
* Add getters for swarm sort context
* Add method to sum all points in all cells. This method can optionally use the sort context, although if its not available it wi

DMSwarmPIC point counting utils:
* Add getters for swarm sort context
* Add method to sum all points in all cells. This method can optionally use the sort context, although if its not available it will compute the cell counts via simply walking through the entire point list in the DMSwarm

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DMSwarm event logging:
* Log memory management operations (add, remove points) and the setup for the sort context

DMSwarm event logging:
* Log events related to data movement between MPI-ranks

DMSwarm/DataBucket:
* Add variable for using default buffer rather than putting in -1

DMSwarm - sort context:
* Added utility for efficient traversal of points in a cell-wise manner