New commands to run ANTLR from within Emacs and

New commands to run ANTLR from within Emacs and
to create Makefile rules.
(antlr-tool-command): New user option.
(antlr-ask-about-save): New user option.
(antlr-makefile-specification): New user option.
(antlr-file-formats-alist): New variable.
(antlr-special-file-formats): New variable.
(antlr-unknown-file-formats): New user option.
(antlr-help-unknown-file-text): New variable.
(antlr-help-rules-intro): New variable.
(antlr-mode-map): Add [C-c C-r] for `antlr-run-tool'.
(antlr-mode-menu): Add entries.
(antlr-file-dependencies): New function.
(antlr-directory-dependencies): New function.
(antlr-superclasses-glibs): New function.
(antlr-run-tool): New command.
(antlr-makefile-insert-variable): New function.
(antlr-insert-makefile-rules): New function.
(antlr-show-makefile-rules): New command.

More Emacs/XEmacs stuff.
(antlr-no-action-keywords): New constant with value nil.
(antlr-font-lock-keywords-alist): Use it.  Old value would break
syntax highlighting in Emacs-21.0.
(antlr-default-directory): Emacs/XEmacs dependend function.
(antlr-read-shell-command): Ditto.
(antlr-with-displaying-help-buffer): Ditto.

imenu, parsing and highlighting changes.
(antlr-imenu-create-index-function): Don't create extra submenus
for definitions in different grammar classes.  It is not necessary
for the menu and would make command `imenu' awkward to use.
(antlr-skip-file-prelude): With ANTLR-2.7+, you can specify named
header actions and more than one.
(antlr-font-lock-tokendef-face): Changed color.
(antlr-font-lock-tokenref-face): Changed color.
(antlr-font-lock-additional-keywords): Also highlight lowercase.
(antlr-mode-syntax-table): New variable.
(antlr-mode): Populate and use it instead `java-mode-syntax-table'.
(antlr-with-syntax-table): Don't copy syntax table.

Minor changes: language setting.
(antlr-language-alist): The value for file option "language" can
be both an identifier and a string.
Reported by Rajesh Radhakrishnan <radhakrs@email.uc.edu>.
(antlr-language-limit-n-regexp): Change accordingly.

Minor changes: tabs, hiding.
(antlr-tab-offset-alist): Set `indent-tabs-mode' to nil instead t.
(antlr-action-visibility): Also allow value nil to also hide the
braces.  Renamed from `antlr-tiny-action-length'.
Suggested by Jay@aol.com.
(antlr-hide-actions): Change accordingly.  Hide line if completely
hidden action is on a line of its own.