Update standard behavior of subcommand auto

New default behavior is to save the downloaded and processed files
to minimize unnecessary downloads and processing.

"import_data.py auto urls_file outdir --wipe": clean and restart the DB.
"import_data.py auto urls_file outdir": download and process new things
from urls_file.

Also, output directory must be provided manually as of this commit.
Merge branch 'import_data' of github.com:joelgoop/demokratikollen into import_data

Conflicts:
	demokratikollen/import_data.py
Reimplement remove_col_in_insert

Now using a horrible regex, which probably is faster and hopefully
uses less memory than parsing.
Add chains for 'propositioner' docs
Increase memory in VM to 2048 MB

1024 MB was not enough to clean prop-2010-2013.sql. Next try was 2048 MB,
and it works well.
Add 'propositioner' to list of docs (urls.txt)