Bugfix: set low-energy data in the low-energy constraint.

This bug affects only the SMINPUTS parameters set in the SLHA input
file.  These SM input parameters were not used correctly in the
low-energy constraint.
update ChangeLog
initialize signs to 1, instead of 0
make sign(vS) configurable via the SLHA input file
Merge remote-tracking branch 'origin/development' into nmssm-higgs-comparison
use same SM values as in src/ew_input
reduce scan range
increase scan point masses