Removed unused variables in TreeList
Merge branch 'alpha' of github.com:thehogfather/pvsio-web into alpha

# By PaoloMasci (19) and pvs (5)
# Via pvs
* 'alpha' of github.com:thehogfather/pvsio-web: (24 commits)
  improved emulink menus
  minor changes (additional check to avoid runtime errors)
  added support for initial transitions in PVSPrinter
  replace typecheck button with compile button (compile typechecks the pvs spec and reloads pvsio)
  bugfix for pvs printer (was using state id rather than state name)
  improved rendering of Emulink default initial transitions + bugfixes for function load Emulink diagram
  default initial transitions for Emucharts
  PVSPrinter: added generation of subtypes for function arguments
  minor changes in Emulink toolbar
  minor changes in Emulink (updated css style for disables menu items)
  PVS Printer generated PVS file in PVS editor + various bugfixes for prototypebuilder (mistyped event types, selectedData was not cleared after removing selected item from treelistview)
  bugfix for Emucharts editor (transitions were not drawn when dragging the arrow from right to left due to missing Math.abs() in event handler)
  introduced notification areas, improved save and saveall buttons (now they are consistently enabled and disabled when needed), improved compile and typecheck (they automatically save the selected file if the file is unsaved)
  fixed TCAS demo (file pvs-attachements was erroneously ignored by git because of the configuration in .gitignore)
  various bugfixes for image (svg dimensions were not updated when changing image), PVS editor (import files and set main file were not working), FileTreeView (no file selected when a file was removed)
  minor change (pvs editor starts collapsed)
  updated widget definition for AlarisPC
  bugfix: pvsioweb server was firing events multiple times (due to multiple listeners installed for the same event)
  minor optimisations designed to reduce processing overhead
  another missed file for bugfix https://github.com/thehogfather/pvsio-web/commit/4b125da818e4f3e3563164406fa21dd2987cd2c1
  ...
Removed unused variables in pvsprocess module.
start function now takes two variables the file name and a callback to use for notification when the process is ready and when the process exits