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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#! gmake

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# Makefile to generate XSLT stylesheets from ysl2 files in the same directory

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# This uses YML2. 

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#   hg clone https://pep.foundation/dev/repos/yml2/

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# It should be just fine if yml2 is cloned just asside beremiz

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# otherwise, point yml2path to yml2 source directory

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#   make yml2path=path/to/yml/dir

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yml2path ?= $(abspath ../../yml2)

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ysl2files := $(wildcard *.ysl2)

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xsltfiles := $(patsubst %.ysl2, %.xslt, $(ysl2files))

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all:$(xsltfiles)

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%.xslt: %.ysl2 ../yslt_noindent.yml2

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	$(yml2path)/yml2c -I $(yml2path):../ $< -o $@.tmp

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	xmlstarlet fo $@.tmp > $@

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	rm $@.tmp

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clean:

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	rm -f $(xsltfiles)