renamed commandhandler to iohandler

the name commandhandler might be misleading, as it has nothing to do
with SECoP commands

Change-Id: I31bbe1cefd49927fc591619dc7f41f332cca2c14
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/22084
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop/__init__.py

@@ -28,7 +28,7 @@ from secop.datatypes import *
 from secop.modules import Module, Readable, Writable, Drivable, Communicator, Attached
 from secop.params import Parameter, Command, Override
 from secop.metaclass import Done
-from secop.commandhandler import CmdHandler, CmdHandlerBase
+from secop.iohandler import IOHandler, IOHandlerBase
 from secop.stringio import StringIO, HasIodev
 
 

secop/iohandler.py

@@ -18,7 +18,7 @@
 # Module authors:
 #   Markus Zolliker <markus.zolliker@psi.ch>
 # *****************************************************************************
-"""command handler
+"""IO handler
 
 Utility class for cases, where multiple parameters are treated with a common command.
 The support for LakeShore and similar protocols is already included.
@@ -177,7 +177,7 @@ class Change:
         return self._reply
 
 
-class CmdHandlerBase:
+class IOHandlerBase:
     """generic command handler"""
 
     def __init__(self, group):
@@ -302,7 +302,7 @@ class CmdHandlerBase:
             setattr(module, k, v)
 
 
-class CmdHandler(CmdHandlerBase):
+class IOHandler(IOHandlerBase):
     """more evolved command handler
 
     This command handler works for a syntax, where the reply of a query command has