consors-report.py: Convert to comma separated input

consors-report.py: Convert to comma separated input

Consorsbank changed its format from semicolon separator without quotes
to comma separator with quotes. Move to the `csv` stdlib module for that.

Convert old to new format with:
```py
import csv
import sys

with open(sys.argv[1], 'r') as csvfile:
    reader = csv.reader(csvfile, delimiter=';', quotechar='"')
    writer = csv.writer(sys.stdout, delimiter=',', quotechar='"')
    for row in reader:
        writer.writerow(row)
```