[tex-live] Updates to new TL installer GUI

[Siep Kroonenberg]

I uploaded some changes to the installer tcl GUI mode, which should
now be available from most mirrors.

- @Mojca: you can now specify preference for a particular wish with
  a WISH environment variable, except on windows, which always uses
  the supplied tclkit runtime.

- The Close buttons got suitable callbacks

- @Lars Madsen: an environment variable dbgui=1 causes some extra
  lines of output to be written to the terminal, each starting with
  'dbgui:'. Does the advanced menu still fail to show up? If so,
  what dbgui output do you get? And is wish mostly idling or using a
  lot of cpu time?

I am still working on correct resizing and on the collections
dialog. In the meantime only the log window is resizable, and a bug
where translation was not taken into account has been fixed.

-- 
Siep Kroonenberg