This PR makes an initial implementation of a fiberassign holding pen. Afternoon planning and the NTS looking for fiberassign files both in the holding pen and in the main fiberassign directory when deciding what tiles are available to observe. If a given TILEID is only in the holding pen, and is requested during the night, it is copied into the main directory before the NTS returns it.
Coverage decreased (-0.3%) to 34.082% when pulling 6975c8393f9139880c89c95c1b086c28e22cd57c on holdingpen into 02b41e645eaf70220f841e6b92ff5b543a6e96e8 on master.
This PR makes an initial implementation of a fiberassign holding pen. Afternoon planning and the NTS looking for fiberassign files both in the holding pen and in the main fiberassign directory when deciding what tiles are available to observe. If a given TILEID is only in the holding pen, and is requested during the night, it is copied into the main directory before the NTS returns it.