Arrange for the new accessiblewidget to be both distributed and insta…

…lled.

Compile with Tcl's attemptgetstring branch

speed up Tk with additional Tcl_DoOneEvent idle processing in updateL…

…ayer

Merge trunk

TIP #742: Add Control+MouseWheel zoom support to Tk console

Build with Tcl with TIP #741

Fix [095db8b350]: ::tk::startOfCluster (and friends) only understand …

…ICU locale syntax

Merge trunk

Windows build is broken, this hopefully fixes it, see [e770378a5ba56ca2]

Avoid hard-coding the set of Tcl hidden commands and aliases [tcl:8f5…

…e7a2633]