leftbar.html.yuidoc

- library/lib/nxdoc-xowiki.tcl: Finished and polished the xowiki backend for nxdoc. Some tests regarding relative paths and the treeview generation are pending ... - library/lib/nxdoc-xowiki.tcl: Use the built-in base64 facility if running under Tcl 8.6 - Due to re-introducing nested-object-as-method semantics lately, nxdoc started stumbling over name conflicts between nested entity hierarchies (i.e., the entity object representing "/cls/ class info class" ...) and equally-named introspection calls on such entities (e.g., a "info class" call). I made these calls more robust my using -system dispatches; which is fine as long as we do not have sth. like "/obj/ info eval". Generally speaking, the risk of such naming conflicts discredits the use of object nesting in nxdoc; should eventually be revised. Or, as work-around: Using a filter on Entity instances to protect/redirect critical calls.