Fast photometry

With the new detector controller we no longer have the option to use the sequencer board developed to do multi-window fast-photometry with ALFOSC. This is not a major problem as the increased readout speed with the new controller allows to get similar readout performance using a relatively large window on the CCD. However, this is an area where things can be improved and we need to define how we can provide time-series observations with minimal overheads. Such a ``fast-photometry'' option might include specific settings which are not implemented during normal observing (e.g., data saving on the local observing system disk).