Sync with upstream verilog-mode r840.

Sync with upstream verilog-mode r840.

* lisp/progmodes/verilog-mode.el (verilog-mode-version)
(verilog-mode-release-date): Update.
(verilog-auto-lineup, verilog-auto-reset): Doc fixes.
(verilog-sig-tieoff): Fix string error on
AUTORESET with colon define, bug594.  Reported by Andrew Hou.
(verilog-read-decls): Fix parameters confusing
AUTOINST interfaces, bug565.  Reported by Leith Johnson.