py_ext: fix CSV Writer

fix POU logic :
- SAVE is a BOOL
- invocation of py_eval on rising edge of SAVE
- remove save python argument

fix python:
- use no encoding for file open (python2)
- re-use detected dialect if any
- use no "rt+" and truncate since no need to re-sniff dialect for output file
- return "OK" instead of "#SUCCESS", preventing POU logic to ACK result
- support creating new line if writing just after last line
- support appending data on short rows

fix example:
- use a HMI:Button to trigger CSV write instead of HMI:Input +1
- reload CSVs on on each new CSV opened in file browser
- add display of CSV write output

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# opcua/__init__.py

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from .client import OPCUAClient

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# class RootClass(object):

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#     XSD = """<?xml version="1.0" encoding="ISO-8859-1" ?>

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#     <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

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#     </xsd:schema>

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#     """

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#     CTNChildrenTypes = [("OPCUAClient", OPCUAClient, "OPCUA Client")]

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#