need to use SARAH[OutputDirectory] in SARAH > 4.0.3
disable Solve::ifun warning when calculating the Weinberg angle

The equation that we're trying to solve contains Sin[] and Cos[] of
the Weinberg angle.  Mathematica's Solve[] function will use the
inverse functions of Sin[] and Cos[] to solve the eq.  But since Sin[]
and Cos[] are invertible only on a finite interval, some solutions
will therefore not be found.  Therefore this warning will appear.

However, we're restricting us to the case where all gauge couplings
are positive and real, so some solutions are irrelevant anyway.
Furthermore we will restrict ourselfs to one solution.  Therefore it
is save to suppress this warning.
Merge branch 'master' into development
adding bibliography
adding extra space after the \MSbar and \DRbar macros
adding numerical values for alpha_em and alpha_s
adding more helper macros
adding QCD papers for bottom and top quark masses
dumping low-energy mass formulas into the manual

Still missing:
 * formatting
 * what does "heavy" mean?
reformat a bit and explain user input and heavy self-energies
exclude test/ directory from Doxygen documentation
adding Doxygen mainpage file (still to be filled)
document directories
using simpler SM definition of the Weinberg angle
try the SM definition of the Weinberg angle first

This increases the probability that we do not need to call Solve[]
because the SM definition is correct in most models.  However, all of
this will fail in the UMSSM where the Higgs quantum numbers are not
fixed (=> there will only be a solution if the quantum numbers are
fixed to some non-anomalous values).
print warning if SM-Weinberg angle does not solve eqs.

This might hint the user to bugs in the def. of the Weinberg angle.
point user to configure flags in case a library / package is missing
update Jae-hyeon's email address
update the quick start section with the new ./createmodel interface
write a workflow section and correcting ./createmodel usage