Added legend/legends for image/image grid.
Test for distribution chart.
Blocking scrolling.
Convenience functions to start/stop servers.

Also added support for different ports.
Added a gfx.ps script to list running servers.
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Added list() and redraw() functions.

list(N) lists the last N elements/figures available.
redraw(N) redraws these last N elements/figures.
redraw(id) redraws a specific figure.
Updated help.
Fixed order of redraw()
Global export