Upstream changes:
(from http://joewing.net/projects/jwm/release-2.3.shtml#v2.3.7 )
Changes in 2.3.7 (20170721)
* Made the modifier for dragging a window by clicking its contents
configurable via the mask attribute of the MoveMode tag (issue #324).
* Added group options for setting initial window position and size
(issues #79 and #348).
* Added the clicktitle and sloppytitle options for FocusModel, which cause
windows to be raised only when the title or border of the window is clicked
(issue #286).
* Fixed scaling of icons in the task bar (issue #328).
* Added the decorations attribute to TaskListStyle to allow setting different
decorations on tray buttons and task list buttons (issue #330).
* Fixed a bug with the nextstacked key binding (issue #335).
* Improved support for 3-digit hexcode colors (issue #336).
* Better aerosnap support on multiple monitors (issue #342).
* Fixed a bug with multiple separators in menus (issue #343).
* Fixed a bug with blank trays when there are full screen windows
(issue #356).
* Added the spacing attribute to Dock to allow adding space between icons in
the dock (issue #357).
* Added support for dynamic root menus via the dynamic attribute of RootMenu
(issue #221).
* Fixed an issue with 32-bit TrueColor visuals on some platforms.
* Fixed an issue with menus and multiple monitors (issue #384).
* It is (once again) possible to disable desktop switching by scrolling on
the desktop using an empty root menu (issue #366).
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