2013-02-07  Didier Verna  <didier@didierverna.net>

	Support for file/mode-specific styles and actions in whitespace.el.
	* whitespace.el: Update comments throughout the file for this new
	feature.
	(whitespace-style-custom-type): New constant.
	(whitespace-style): Use it. Update and improve docstring format.
	(whitespace-file-style)
	(whitespace-mode-style): New user options.
	(whitespace-style): New function. Handles file and mode-specific
	style settings introduced by the above new user options. Used
	throughout the file instead of the just the eponym variable.
	(whitespace-action-custom-type): New constant.
	(whitespace-action): Use it. Update and improve docstring format.
	(whitespace-file-action)
	(whitespace-mode-action): New user options.
	(whitespace-action): New function. Handles file and mode-specific
	style settings introduced by the above new user options. Used
	throughout the file instead of the just the eponym variable.
	(whitespace-cleanup)
	(whitespace-cleanup-region)
	(whitespace-report-region): Update docstring. Use the
	`whitespace-style' function instead of the eponym variable.
	(whitespace-interactive-char)
	(whitespace-toggle-list)
	(whitespace-turn-on): Handle file/mode-specific styles.
	(whitespace-action-when-on)
	(whitespace-write-file-hook)
	(whitespace-warn-when-read-only): Handle file-mode-specific
	actions by using the function `whitespace-action' instead of the
	eponym variable.
	(whitespace-space)
	(whitespace-hspace)
	(whitespace-tab)
	(whitespace-newline)
	(whitespace-trailing)
	(whitespace-line)
	(whitespace-space-before-tab)
	(whitespace-indentation)
	(whitespace-empty)
	(whitespace-space-after-tab)
	(whitespace-hspace-regexp)
	(whitespace-tab-regexp)
	(whitespace-trailing-regexp)
	(whitespace-space-before-tab-regexp)
	(whitespace-indentation-regexp)
	(whitespace-empty-at-bob-regexp)
	(whitespace-empty-at-eob-regexp)
	(whitespace-space-after-tab-regexp)
	(whitespace-line-column)
	(whitespace-display-mappings)
	(whitespace-style-value-list)
	(whitespace-active-style)
	(whitespace-toggle-options)
	(global-whitespace-toggle-options)
	(whitespace-report): Update docstrings.