Dcoraid

- fix: error message in preferences user tab no connection available
- enh: allow to select upload cache directory in CLI
- enh: allow to select upload cache directory in GUI
- enh: make sure temporary cache directories for uploads are removed
- enh: replace lru_cache with weak_lru_cache for instance methods
- setup: bump dclab from 0.49.0 to 0.50.2
- setup: bump urllib3 to 2.0
- setup: bump requests_toolbelt to 1.0

- setup: bump dclab from 0.48.4 to 0.49.0 (support tables)

- setup: stop pinning dclab version

- enh: GUI map "Search" button to "Enter" in "Find Data" UI
- enh: GUI workaround for unresponsive widgets in tab widget: add labels
- ref: GUI migrate "browse public" tab to its own widget

- feat: GUI append the directory name to ZMD (M001_data.rtdc) uploads
- feat: GUI support drag&drop of task files to upload tab (70)
- enh: replace ttl_cache with requests_cache (69)
- fix: aborting one upload/download job aborts all jobs (71)

- fix: reduce progress print statements in dcoraid-upload-task CLI
- fix: occasionally the download path was computed incorrectly
- enh: GUI check for visibility before updating widgets with QTimer