ezmultiupload 6.1.8: quick location buttons

• Added: Quick location buttons on the upload page, under the target location: Websites and Media, then a row
  with the locations right below each (the sites; Images, Files, Multimedia and the others under Media). One click
  makes a place the target, as Change location... does, which stays. They are found from the content tree and
  content.ini through the kernel's expNodeQuickPick (Exponential 6.0.15; without it there are none), and only
  locations where the user may create the classes uploaded files become are offered. The target's button is pressed
  (aria-pressed), the place it lies in is marked. admin4 and admin4l, and the classic page of design/admin.
  Settings: ezmultiupload.ini [QuickLocationSettings]; template: ezmultiupload/quick_locations.tpl.
• Added: Images and Files right after Media in the first row (PresetList[] media/images,
  media/files, found by their URL alias paths; translated labels from PresetLabels[]); the row under Media leaves
  them out.
• Added: The dashboard's Upload files button opens the upload page at Media > Images where the user can upload
  there, else at Media ([DashboardSettings] UploadTargetList[], fetch function dashboard_target,
  expMultiuploadService::dashboardTarget()), with the dashboards of Exponential 6.0.15 and exp_adminui 1.0.0.43.
• Added: The fetch function quick_locations and expMultiuploadService::quickLocations(), quickLocationAllowed(),
  uploadClasses(), quickLocationSettings().
• Added: A location of the page's script has pathIds, the ids of its path (the picker's rows leave them out).
• Added: The hidden field exp-mu-location-id holds the target of the new page.