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

     1

BEREMIZ_OBJS = $(BEREMIZSRC:.c=.o)

     2

     3

all: warn some_binary

     4

	@echo "*** all done ***"

     5

     6

warn:

     7

	@echo "*** Sample Makefile, does nothing ***"

     8

     9

some_binary: $(BEREMIZ_OBJS)

    10

	@echo "* Would link $^ -> $@"

    11

    12

%.o: %.c

    13

	@echo "* Would compile $< -> $@"