NUC-UPS firmware changelog for firmware v1.4

Changes in default parameters
UPS_VCELL_MIN_START=3525mV
UPS_VCELL_MIN_STOP=3550mV 
UPS_VCELL_MIN_HARD_STOP=3200mV

CHG_CELL_VCOND=3100mV

OCV_SOC0=3000
OCV_SOC10=3100
OCV_SOC25=3600
OCV_SOC50=3700

Feature changes:
-slightly decreased the 1A bulk charge current with ~75mA for smoother charging
-better control when the UPS is started:	
	VIN_MIN_STARTUP parameter is used to control when the UPS is started when powered from input
-better control when the output is started with very discharged batteries in order to have glitch free output:
	12V output is started only if overall battery voltage is greater than  4 x UPS_VCELL_MIN_START
	overall battery voltage should be at least 12.6V(3.15V/cell) in order to provide 12V output
	Example: 
	UPS_VCELL_MIN_START=3200mV sets the minimum startup voltage when output is ON to 12.8V overall battery voltage
	UPS_VCELL_MIN_START=3150mV sets the minimum startup voltage when output is ON to 12.6V overall battery voltage
	UPS_VCELL_MIN_START=3100mV sets the minimum startup voltage when output is ON to 12.6V overall battery voltage
	So even if UPS_VCELL_MIN_START is set to a lower value  than 3.15V the 12.6V threshold is hardcoded
-increased the UPS_VCELL_MIN... parameters for glitch free output with low batteries
-decreased CHG_CELL_VCOND from 3.3V to 3.1V in order to charge low voltage batteries sligthly faster 
-decreased the OCV_SOC... parameters in order to estimate slightly higher capacity at powerup for low voltage batteries