Summary of Changes for Proof General 2.1
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* Supports Coq 6.3

* Supports Isabelle 99.  No guarantees for Isabelle 98.

* Two new provisional instantiations of Proof General, for:
   ** Isabelle/Isar (new proof language for Isabelle) by 
      Markus Wenzel <wenzelm@informatik.tu-muenchen.de>
   ** Plastic (http://www.dur.ac.uk/CARG/plastic.html)
      by Paul Callaghan <P.C.Callaghan@durham.ac.uk>.

* Documentation improvements.   
  Information added for Coq mode.

* In proof-site.el, the environment variable PROOFGENERAL_ASSISTANTS 
  is examined for the default value of proof-assistants.  No
  editing of proof-site.el should be needed now.

* Support for x-symbol package to beautify 
  input and output with special fonts.
  Patches for Isabelle provided by David von Oheimb.
  (currently incomplete)

* Improvements to Coq mode: better recognition of
  Coq syntax, support for proof-shell-restart-cmd.

* Toolbar can now be switched on and off via menu.

* Bug fixes:
   - Long-lines with funny characters causing ^G's in Solaris.
   - Templates in Isabelle theory file mode.
   - Fix for case-insensitive matching.  Added proof-case-fold-search 
     configuration variable to allow for proof script languages with 
     case-insensitive syntax.
   - Process killing made robust.
   - Regular expression fixes causing "nil extent" errors.