DataBucket:* Use SETERRQ()
DataBucket:* Added return args of PetscErrorCode
DataBucket:* Adding PetscErrorCode into data bucket object
DMSwarm:* Added Create{Global,Local}Vector
DMSwarm:* Adding more basic functionality
DMSwarm:* Add basis get/restore for fields
DataBucket:* Removed unused code
DataBucket:* removed used definition
databucket:* code-reformat
DMSwarm:* small clean-up and renaming of vars
DataBucket:* Use petsc datatypes
DMSwarmDB:* Added object for managing fields
DMSwarm method:* Added source files
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