Correct filename extension

[MatthewWhiting]

The extension .fits is not preferred.
Search (or survey) files should have .sf as their extension.
Timing observation, or dedicated observations of a known source should have .rf.

The distinction should be primarily on the MOVE flag (0 for .rf). Maybe also check things like SCANLEN matching the requested survey setup (although problematic if there are dedicated observations of known pulsars with survey sensitivity for testing purposes) or whether or not there is just a single position in the file (but what if there's a survey file with just one sky position?).

[MatthewWhiting]

This has been enabled in [112].

The state is determined by the getObs_mode() function, which effectively uses the MOVE parameter as a discriminator.

Note that the Multibeam files are currently all set on "SEARCH", and so will produce .sf files.

[MatthewWhiting]

Closing ticket.