+ Redid file associations on Win2K in what I believe is "the right way".

+ Redid file associations on Win2K in what I believe is "the right way".
  Can't test it until getting to a Win2K box, because the non-Admin way
  of setting file associations on Win2K doesn't work on any other flavor
  of Windows (and other flavors of Windows never need Admin privs to
  do it the old way).
+ Consequently got rid of the "Register file associations" Component and
  associated GUI.
+ Added a line to the summary saying whether or not this is an Admin-level
  install (I fear that will be an important clue someday).
+ Minor fiddling to the summary to reduce the # of lines.  Added a
  horizontal scrollbar in case the install path is very long.
+ Reworked the way the Main and Tools components share pydoc.pyw; cleaner
  and simpler.