Slight GUI changes
changed / to - in suggested date format
fixed bug where null keyType would become "null"
default margin change
set default margins
newly created tools now appear in upper-left corner instead of center
Improving layer editing interface.
Fixed data table crashing bug.
CustomDataGridCell now implements IDropInListItemRenderer.
Cleaned up whitespace.
Fixed bug where no axis labels would be shown whyen only one was
requested.
Now catching and reporting errors in DateColumn.
Axis titles and visualization titles now have separate font settings.
FontControl is now a registered editor for LinkableTextFormat.
registered TextGlyphPlotter as IPlotter implementation
Added fill color controls
swapped order of x,y axis tabs
added SubMenu default event values (mouseDown)
Improved labels
Reverse button is now an icon
default wms is now OSM
Replaced old map layer interface with new one.  Improved labeling.
Combined alwaysAbove/alwaysBelow settings and buttons into one (zOrder).
SliderTool now sets zOrder=Infinity.
AttributeMenuTool now sets default session state in constructor()
instead of childrenCreated().

Change-Id: Ie276f5d8933521efbc5adc301c45ad9fc03b7597