A Table/Matrix Widget Extension to Tcl/Tk

The basic features of the widgets are:

* multi-line cells
* support for embedded windows (one per cell)
* row & column spanning
* variable width/height columns/rows (interactively re-sizable)
* row and column titles
* multiple data sources ((Tcl array || Tcl command) | internal caching)
* supports standard Tk reliefs, fonts, colors, etc.
* x/y scrollbar support
* 'tag' styles per row, column or cell to change visual appearance
* in-cell editing - returns value back to data source
* support for disabled (read-only) tables or cells (via tags)
* multiple selection modes, with "active" cell
* multiple drawing modes to get optimal performance for larger tables
* optional 'flashes' when things update
* cell validation support
* works everywhere Tk does (including Windows and Mac!)
* unicode support (Tk8.1+)