Use standard units for pressure measures, let user choose conversion

examples/read-all.py

@@ -57,7 +57,7 @@ try:
         if sensor.get_sensor_data():
             output = '{0:.2f} C,{1:.2f} hPa,{2:.2f} %RH'.format(
                 sensor.data.temperature,
-                sensor.data.pressure,
+                sensor.data.pressure / 100.0,
                 sensor.data.humidity)
 
             if sensor.data.heat_stable:

examples/temp-offset.py

@@ -24,7 +24,7 @@ def display_data(offset=0):
     sensor.get_sensor_data()
     output = '{0:.2f} C, {1:.2f} hPa, {2:.3f} %RH'.format(
         sensor.data.temperature,
-        sensor.data.pressure,
+        sensor.data.pressure / 100.0,
         sensor.data.humidity)
     print(output)
     print('')

examples/temp-press-hum.py

@@ -31,7 +31,7 @@ try:
 
             output = '{0:.2f} C,{1:.2f} hPa,{2:.3f} %RH'.format(
                 sensor.data.temperature,
-                sensor.data.pressure,
+                sensor.data.pressure / 100.0,
                 sensor.data.humidity)
 
             print(output)

library/bme680/__init__.py

@@ -291,7 +291,7 @@ class BME680(BME680Data):
             self.data.temperature = temperature / 100.0
             self.ambient_temperature = temperature  # Saved for heater calc
 
-            self.data.pressure = self._calc_pressure(adc_pres) / 100.0
+            self.data.pressure = self._calc_pressure(adc_pres)
             self.data.humidity = self._calc_humidity(adc_hum) / 1000.0
             self.data.gas_resistance = self._calc_gas_resistance(adc_gas_res, gas_range)
             return True