Update mapping for embem indices

Added dynamic mappings for entities and entity pairs, to ensure they are
not treated as full text fields. This was done, because we want to
aggregate over the values in these fields, so they must not be analyzed.
Add debates2es script (again)

Due to an error, the debates2es script is is unclear whether the script
was added to the repository. So, it was added again.

Refs 8fa3accb670c665f6db420e291a2bc617f836994
Add csv files to .gitignore
Add script to generate pairs of LIWC categories

Added a script that generates pairs of LIWC categories for Body and
Posemo words. The pairs are added to the index. And data about the pairs
is written to std out.
The LIWC categories for which pairs are generated are hardcoded. This
should be changed. Also adding the pairs to the ES index should be made
optional.