Dcor-control

- fix: add ckanext.dc_serve.tmp_dir, a temporary data location for
condensing data before uploading to S3
- enh: upgrade pip when updating packages

- enh: update package located in /testing in dcor update
- enh: also check S3 storage for orphaned objects in `dcor inspect`
- enh: always encrypt beaker session cookies
- enh: set up cookies more strictly
- enh: always perform CSS rebranding after `dcor develop`
- enh: install additional dependencies in `dcor develop`
- enh: introduce "dcor_object_store.local_backup_location" configuration
option and check write permissions
- enh: add "etag" to search pattern
- ref: migrate to dcor_shared 0.7.5
- setup: pin uwsgi==2.0.21 due to non-working harakiri

- enh: properly check for nginx status before attempting to reload

- maintenance release

- enh: add dcor_control to compatible version list
- cleanup

- fix: fix compatible versions header