An action with more than ~250 nodes ends in 414 Request-URI Too Large

[raffis]

Describe the bug

If one selects a total number of around ~250 nodes the request uri exceed 8000 characters and nginx will decline it with a 414.

To Reproduce

1. Add 250 nodes to the trash
2. Mark alll nodes and hit restore

Expected behavior

The client must split those requests into chunks of ~200 nodes.
(All requests which allow batching nodes. Download, Restore, Delete, Move, Copy, ...)

The server v3.0 will have a batch endpoint gyselroth/balloon#283 but even this endpoint will probably have a limit of actions and the client has to send multiple requests.

Environment

• web-client version: v3.2.5
• balloon server version: v2.6.1
• Deployed as: [e.g. docker,deb package,tar,compiled manually]
• client os: [e.g. Linux Mint 19.2]
• browser: [e.g. Firefox 62]

Additional context

Add any other context about the problem here.

[raffis]

The easiest solution is most likely just to limit the max. selectable nodes to 100.