Dcoraid

- feat: implement persistent upload resource schema presets (9)
- fix: do not allow user to proceed with upload unless 'authors'
is specified (to avoid cryptic error message)
- fix: minor issue of visualizing whether user changed
supplementary resource information
- enh: enable DCOR usage (anonymous and registered users)
- enh: make sure the user really wants to upload datasets without
editing any metadata (10)
- enh: improve upload dialog understandability
- ref: migrate preferences to QSettings
- ref: refactor upload dialog to a real dialog

- enh: send DCOR-Aid user-agent string

- fix: force restart of DCOR-Aid upon wizard end
- fix: improve handling of cache and config directories

- fix: allow resuming when upload fails (3)
- fix: start even if DCOR is down
- fix: do not display mean upload rate during upload
- fix: require restart when server is changed
- enh: ask user to create a Circle when the user is not member of any
- enh: add basic wizard functionalities
- enh: resource upload supports supplementary resource schemas
- enh: stick to package_revise when finalizing dataset
- enh: verify resource uploads via SHA256 sum (7)
- enh: fetch license list directly from server
- enh: functionalize action buttons in upload
- enh: increase verbosity of CKANAPI
- enh: implement resource compression (6)
- ref: move connectivity check and user database update to separate
background threads
- ref: store traceback of failed upload in job info

- enh: allow to create the circle if it does not exist during dataset
creation
- fix: set "state" to "active" in dictionary returned by `create_dataset`
- fix: catch error when user uses `CKANAPI.get` when he should use
`CKANAPI.post`

- basic upload functional