(texinfo-format-begin-end): Bind cmd locally.

(texinfo-format-begin-end): Bind cmd locally.
(texinfo-defun-type): Renamed from command-type in various fns.
(texinfo-command-start, texinfo-command-end, texinfo-command-name)
(texinfo-defun-type, texinfo-last-node-pos, texinfo-stack)
(texinfo-short-index-cmds-alist)
(texinfo-short-index-format-cmds-alist, texinfo-format-filename)
(texinfo-footnote-number, texinfo-start-of-header)
(texinfo-end-of-header, texinfo-raisesections-alist)
(texinfo-lowersections-alist): Add defvars.