[TD-86] Implement a per-request processing timeout

[taskwarrior]

Paul Beckingham on 2014-12-29T19:00:05Z says:

Prevent single sync requests from taking too long by providing a configurable timeout mechanism.

[taskwarrior]

Migrated metadata:

Created: 2014-12-29T19:00:05Z
Modified: 2015-02-28T18:26:56Z

[madduck]

Please up the priority on this one. I am using the inofficial TaskWarrior app on Android (the one that wraps task in a nice GUI), and it happens every few days that the connection hangs, e.g. because I switch networks or lose connectivity. As a consequence, the server process actually waits indefinitely, making sync impossible for all users.

Of course, it'd be even better to be able to handle multiple requests, as per #72 and #85, but killing a connection after a number of seconds of inactivity would already go a long way.