-Meaningful texts are provided instead of commands in File menu (e.g. restore->Load Shape (restore))
-tk_getOpenFile is used in "open file" dialogs
-tk_chooseDirectory is used in "change directory" dialog
-Added menu "Help" with submenus "System info", "Commands", "About", "User Guide"
-Added menu "Samples" with submenu "View samples"
-Added menu "Load" with submenus "pload <Module>"
Tcl samples moved from src/DrawResources to samples/tcl.
Scripts VisualisationDemo.tcl and ModelingDemo.tcl fixed to work on Windows.
File wing.brep moved from src/DrawResources to data/occ, and DataExchangeDemo.tcl corrected.
OCAFDemo.tcl removed, as it has little sense and referred data files are lost
Added sample Tcl script creating a model defined on the 'Open CASCADE challenge' web page
