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set-param-from-ini: setting HAL widgets programmatically

Files:
set-param-from-ini.ini
set-param-from-ini.cfg specifies meter min,max
set-param-from-ini.txt (this)
set-param-from-ini.tcl starts gladevcp and sim_pin
meter_scale.py         gladevcp file
meter_scale.ui         gladevcp file

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Old instructions for running independently:

This example reads values from an ini file, and sets the HAL Meter 
widget min and max properties from them

$ export INI_FILE_NAME=demo.ini
$ gladevcp -u meter_scale.py meter_scale.ui