Fixed a bug in the display of certain label widgets

	modified:   ginga/gtkw/GtkHelp.py
	modified:   ginga/gtkw/plugins/Info.py
	modified:   ginga/gtkw/plugins/Pick.py
	modified:   ginga/qtw/QtHelp.py
	modified:   ginga/qtw/plugins/Info.py
	modified:   ginga/qtw/plugins/Pick.py

- Fixed a bug where certain label widgets were showing up in the wrong place
  - e.g. the values of the current cut levels vs. the entry boxes