snapshot-45

Refactoring

This release includes the refactoring that I did to the frontend and as
such I would ask everybody to be extra attentive when testing it.  This
refactoring was done to plug some potential crashing bugs (I don't know
if anybody has been affected by them) but mostly it cleans up some of
the code.

Changes since snapshot 44:

  - The toolbar is not hidden by default again (if you prefer having the
    toolbar hidden, then add the line "set go-=T" to your ~/.gvimrc
    file)
  - The ATSUI renderer honors the 'guisp' highlighting color
  - Fix the forever bouncing Dock icon bug (Kazuki Sakamoto)
  - Add the "Show Hidden Files" checkbox button to the Save dialog
    whenever the file browser is expanded
  - Frontend refactoring