* when unloading last remaining module from File/Modules/Manage dialog
  box, module table(s) may remain visible and create problems on next
  update (detected once only, unreproducible, please let me know if you
  see this bug)
* moodss minimal -d fails (-d is taken as -display by wish)
* pies shows doubled / slanted 0 line sometimes when resizing
* module development: real values above 2**31-1 (2147483648) must be
  postfixed with .0 in order to be properly displayed in viewers
* if a module is unloaded then loaded again, viewers that monitored
  the unloaded module data will not resume monitoring the newly loaded
  module data since internally Tcl traces on variables were removed
