Update Commentary header.
(tree-widget-theme): Doc fix. (tree-widget-space-width): New option. (tree-widget-image-properties): Look up in the default theme too. (tree-widget--cursors): Only for images with arrow pointer shape. (tree-widget-lookup-image): Pointer shape is hand by default. (tree-widget-icon): Generic icon widget renamed from `tree-widget-control'. (tree-widget-*-icon): Rename from `tree-widget-*-control' and derive from `tree-widget-icon'. (tree-widget-handle): Improve default look and feel of the text representation. (tree-widget): Rename :*-control properties to :*-icon properties. Add :action and :help-echo properties. (tree-widget-after-toggle-functions): Move. (tree-widget-close-node, tree-widget-open-node): Remove. (tree-widget-before-create-icon-functions): New hook. (tree-widget-value-create): Update to allow customization of icons and nodes at run-time via that new hook. (tree-widget-icon-create, tree-widget-leaf-node-icon-p) (tree-widget-icon-action, tree-widget-icon-help-echo) (tree-widget-action, tree-widget-help-echo): New functions.
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