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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#!/bin/sh

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INKSCAPE=inkscape

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for fname in `ls *.svg`; do

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    for i in `cat $fname |grep -o -e '%%[^%]*%%'|sed 's/%//g'` 

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    do

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        if [ $i.png -nt $fname ]; then

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 	    echo "Skip $i"

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        else

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	    rm  -f $i.png

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	    echo "$INKSCAPE" $fname -z -e $i.png -i $i

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	    "$INKSCAPE" $fname -o $i.png -i $i

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        fi

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    done

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done

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cp ico024.png brz.png

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convert -compress none ico???.png brz.ico

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rm -f ico???.png

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convert -compress none poeico*.png poe.ico

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rm -f poeico*.png

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