add pressure meaning and alias device p

devices.py

@@ -77,6 +77,8 @@ class FrappyConfig(Device):
             'config for temperature regulation', type=anytype, default={}),
         'magneticfield': Param(
             'config for magnetic field', type=anytype, default={}),
+        'pressure': Param(
+            'config for pressure', type=anytype, default={}),
         'rotation_z': Param(
             'config for sample rotation (to be used as a3)',
             type=anytype, default={}),

setups/frappy.py

@@ -33,6 +33,10 @@ devices = dict(
             'alias': ['B', 'magfield'],
             'targets': {'se_mf': 20},
         },
+        pressure = {
+            'alias': 'p',
+            'targets': {'se_pressure': 20},
+        },
         rotation_z={
             # possible names of the instruments main omega alias
             # only one of these must be an alias, and this is then used