Resolve "Notify about loss of unsaved changes"

Closes #676

See merge request !749

Resolve "Admin panel - Add project - remove columns "Root map" and "Mapping file""

Closes #700

See merge request !748

Merge branch '776-when-no-default-zoom-level-is-provided-compute-something-reasonable-instead-of-max-zoom-out' into 'master'

Resolve "when no default zoom level is provided compute something reasonable (instead of max zoom out)"

Closes #776

See merge request !747

Merge branch '789-sort-the-lists-of-elements-generic-reactions-select-annotators-and-select-valid-annotators' into 'master'

Resolve "Sort the lists of elements / generic reactions Select annotators and Select valid annotators"

Closes #789

See merge request !745

Resolve "freeze top bar of plugin panel in case multiple plugins are loaded"

Closes #758

See merge request !741

Merge 12.2.2

See merge request !744

Resolve "Internet Explorer on Win10"

See merge request !742

Fixing situation when Molart started with variation overlay not having the aa change information

See merge request !740

Merge branch '674-when-creating-a-project-or-user-that-already-exists-return-proper-http-status-code' into 'master'

Resolve "when creating a project or user that already exists return proper http status code"

Closes #674

See merge request !738

Resolve "list of reaction"

Closes #615

See merge request !737