XDisplay - added new command displaying XDE document in ViewerTest map of object:
> XDisplay Doc [label1 [label2 [...]]] [-explore {on|off}] [-docPrefix {on|off}] [-names {on|off}]
> [-noupdate] [-dispMode Mode] [-highMode Mode]
vstate - added NULL checks.
vdisplay now prints error on attempt to specify unsupported display mode.
verase, vremove now raise Tcl exception on attempt to hide non-existing object.
verase, vremove, vdir now accept name masks like "verase b*".
vremove and vdir output is now consistent to verase command (space-separated list of removed objects).
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