Automatic flux calibration with SALT standards

- fluxcal() now flux-calibrates the science spectra with SALT standard
stars instead of CTIO standard stars.
- fluxcal() now is completely automated and does not ask the user to
input the standard star name -- the 'OBJECT' 0-header keyword (with an
'm' added in front -- PySALT convention for 'm'agnitude-based standard
star) is the standard star name.
- fluxcal() now also flux-calibrates the standard star spectra because
they will be necessary for telluric absorption corrections.
- New function scaleStdStarSpectra() performs analogous flux scaling on
the flux-calibrated standard star spectra.
- Indivtasks(), dictionaries(), and pipehistory() have been updated
accordingly.