Add Pan-STARRS TNS registration daemon

[genghisken]

We need daemon code for registering PS objects onto the Transient Name Server as soon as an object is added to the good list (and the object has a PS name). This involves:

• Creation of the new daemon code
• Introduction of TNS daemon settings into settings.py
• Modification of Django views.py to send messages to the TNS daemon as soon as someone promotes an object to the Good list (and ONLY the good list).

[genghisken]

Code has been created and rolled out. Note that ONLY objects promoted to the Good list from the individual object page are registered instantly. Objects promoted via quickview will wait for the periodic (hourly) TNS cleanup code to run.

Additionally, I fixed two bugs in the Pan-STARRS TNS registration code:

• Negative RA for some objects was being sent to TNS. (This is a weird internal Pan-STARRS IPP problem.)
• Code was taking the first detection rather than the mean coordinates in the TNS RA/Dec registration. (This is not a big problem anyway, since the Pan-STARRS association radius is only 0.5 arcsec.). This is fixed for instant daemon registration only. The code called from cron to fix objects promoted via quickview will still use the first detection. To be fixed.

Additionally, unlike ATLAS, the daemon code will only attempt to register the object being promoted. It does not check the Good List for other objects that haven't yet been registered. The periodic cron job that registers unregistered objects in the Good List (e.g. promoted via quickview) should fix this.

[genghisken]

Daemons are now operational. Recently fixed a problem (NULL psf_inst_mag_sig) for YSE which crashed the daemon. Will roll this out to PSST.