Fixing plot aspect ratio.
Moving 'evolver' around
Compute magnetic fields
Removing profiling header and running faster
Removing broken integration tests.
Reconfiguration of the ArrayEnigne tools.
First pass at adjusting an Engine.
New array engine interface
New system hierarchy
Updating example.
Fixed handling of engines.
Iteration counting fixes for ArrayEngine2
Update examples and profiling.
Support for old format iterations.
Fixes to vector quantities and Velocity