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(tex-region): Pass new arg.

paragraph-separate to a specific list of control sequences.

(tex-common-initialization): Make paragraph-start
and paragraph-separate match a line of $$.

and paragraph-separate match a line of $$.

(tex-send-command): New local var BUF.
Use it when calling buffer-modified-tick.

(tex-send-command):
Switch to buffer before checking for subproc output in it.

if text has not changed since previous tex-send-command.
(tex-send-command-modified-tick): New buffer-local variable.

(tex-send-command): Insert text in the buffer, then use
comint-send-input to send it.

(tex-define-common-keys, tex-mode-map): Move some items from
tex-define-common-keys to tex-mode-map.
Add more menu-enable properties.
(tex-append): Cope with both the original
Pascal-based TeX and the newer C-based TeX.

Enable menu items if only mark is active.

to be applied manually.  It's not worth trying to integrate this with
the rest of the mode more tightly until we decide whether and how
compile's interface is going to change away from a closed subsystem.

        blank is inserted when replacing the asterisk with the file name.