added exponential extrapolation; added option to delete arbitrage points
from smile and then interpolate instead of cutting the smile at the
first arbitrage point and extrapolate from this point; make code more robust
adapt code to new handling of model settings
unify model settings, reformat code, reauthor warnings section
make moneynessGrid and strikeGrid consistent
Merge branch 'markovfixes'
added examples (multi tenor volatilities and svi smile fitting)
extended svi smile section example
remove debug code