Added notion of abstract plot control to be utilized across different plots (time or non-time, for instance)
Added pan controls to non-time plots (some issues with response to ctrl)
Switched fastPlot's keyboard listening strategy to require less vigilant attention to focus
Added corner reset buttons to scatter plot
Introduced an abstract superclass for pan/zoom controls to consolidate
common functionality between the two. Implemented zoom controls, and
re-implemented pan controls.
Added documentation to local controls classes in fastPlot.

Package gov.nasa.arc.mct.fastplot.bridge.controls introduces
several classes/interfaces for dealing with local control
elements in a uniform way; added documentation of the role
of these classes.
Added boundary indicators ("purple arrows") to fastplot.bridge.controls
Implemented various bound management modes for non-time non-time plots
(AutoAdjust, Fixed, SemiFixed)
Added documentation for additional methods in AbstractPlottingPackage
Merge pull request #83 from VWoeltjen/openmct36lc

Introduce local controls for non-time, non-time plots
[Tests] Merge test update with latest from master

Resolves conflicts from merging #83;
code added to same locations, non-overlapping
in terms of functionality.