Iftach Sadeh / ctools

Remove ctools::time_reference constant and handle the time reference for MET either by using the time reference from the input observation, or by adding a hidden "mjdref" parameter. The following tools transparently use the time reference of the input observation:
* ctselect (apply time reference of each input observation)
* ctbin (apply time reference of first input observation)
* csobsselect (apply time reference of each input observation)

A "mjdref" parameter was added the following tools:
* ctobssim
* cslightcrv
* cspull
* csviscube
* csobsdef

…ct, csobs2caldb, csobsinfo, csobsselect, and csphagen. The script cstsmapsplit has cslikelihood as base class.

The new GApplication logger support function take the chattiness level as the first argument.

…oid code duplication in cscripts.