Upstream 1.1.0 resync

Resynchronized with upstream release 1.1.0 and fixed versioning or our release to use local tag +pix4d.

Add DAL's forwarding support and make it work with DAL 3.8.1

This release merged the upstream changes that added support for using DAL's forwarding feature to restrict filter values based on other filters.

DAL's requirement has been bumped to 3.8.1 and corresponding fixes applied.

0.4.0: Merge pull request #2 from Pix4D/support_filter_by_model_field_value

Version 0.4.0 adds:

• support filtering by model field values
• support filtering through multiple relations