(custom-commands): New variable.

(custom-commands): New variable.
(custom-tool-bar-map): New variable.  Initialize using
`custom-commands'.
(custom-mode): Use `custom-tool-bar-map'.
(custom-buffer-create-internal): Insert action buttons only if
tool bar is not used.  Use `custom-commands'.
(Custom-help, custom-command-apply): New function.
(custom-command-apply, Custom-set, Custom-save)
(Custom-reset-current, Custom-reset-saved, Custom-reset-standard):
Use `custom-command-apply' instead of duplicating code.
(customize-group-other-window): Call `customize-group' instead of
duplicating code.
(customize-face-other-window): Call `customize-face' instead of
duplicating code.
(customize-group, customize-face): Add optional args for opening
in another window.
(custom-variable-tag): Don't inherit `variable-pitch' face.
(custom-group-tag): Inherit `variable-pitch' face.
(custom-variable-value-create): Set documentation indentation.
(custom-group-value-create): Make group name a link, instead of
using an extra "go to group" button.
(custom-prompt-variable, custom-group-set, custom-group-save)
(custom-group-reset-current, custom-group-reset-saved)
(custom-group-reset-standard): Minor cleanup.