Patch note

October 18, 2017

Disallow copying of ad-hoc executions.
Developer Comment: This is 100% ideological change as we had this working before disabling it. One-off executions shouldn't be copyable, the machine learning pipeline should we well defined and version controlled if it is meant for production.
Improve error reporting on git repository fetch errors for support.
Load long executions logs without lagging the web client.
Developer Comment: So loading all the longs synchronously was a bad idea to start with. When we have clients that log more than 50k lines of output, you just cannot render all at once. Well, fixed.