gladevcp -add hal_dial widget

hal_dial simulates a mpg or dial.
It can be scaled arbitrarily.
optionally double clicking can change the scaling.
exports hal pins for count, scaled-count and delta_scaled-count
gladvcp -add docs for new Hal_Dial widget
gladevcp -add blink-color and blink-when-off options to LED

You can now have the LED blink when off or blink when on.
You can pick the blink color, so that the blinking state and the
non blinking state do not use the same color.
gladevcp -add LED options to glade editor

Also added 'weight' to the properties so that they
are shown in a specific order instead of randomly
gladevcp -fix blinking in GLADE editor problem with led widget

The first time you added an LED the introspection would fail
becaue blink_rate was set to None - a value outside GObjects int variable.
Now the rate is set to 0. If a user selects a rate between 1 and 99 it is set
to 100 ms. setting it to 0 turns off blinking.
The nice checkbutton in the editor for selecting blinking unfortunately
does not send a signal to LED.py to deselect blinking, only to select it.
so now one must set the rate to zero to stop blinking.
Another oddity of GLADE ....
Merge branch '2.6'

Conflicts:
	lib/python/gladevcp/led.py