#34 Table support

[Tom Downey]

Add an ExpressionTable object (extends JTable). Plus a bean version.

setCellType: text, variable, or expression
setCellText
setCellAlignment
setCellEditable
setParser
setName
setPreferred/Min/MaxRowHeight
setPreferred/Min/MaxColumnWidth
getColHeaders
setColHeaderText

can be added to a parser, then can refer to cells with some syntax like mytable.r1c1 (or see how DataTable handles this).

don't bother with circular reference detection

if add to a JScrollPane, have to add to wcm controller manually and to notifyOnChange; if add to a WCMPanelBean, then don't.

implements InputObject, Computable, MathObject; bean implements ParserMathObject

Can we merge DataTable functionality into this class?

Properly handle grid lines on Macs

spread-sheet like summation capabilities?

is there a way to figure out the cell type from what the user enters, ala Excel's =? or better to explicitly set the type?