Fix issues in doXX channel changeover

Author: dihm

labscript_devices/PrawnDO/blacs_workers.py

@@ -173,7 +173,7 @@ def _dict_to_int(self, d):
         """
         val = 0
         for conn, value in d.items():
-            val |= value << int(conn)
+            val |= value << int(conn.split('do')[-1])
 
         return val
 

labscript_devices/PrawnDO/labscript_devices.py

@@ -80,8 +80,7 @@ def add_device(self, device):
         
         Args:
             device (): Device to attach. Must be a digital output.
-                Allowed connections are a string that ends with a 0-F hex
-                channel number.
+                Allowed connections are a string of the form `doXX`
         """
 
         conn = device.connection