fix direct and inverse functions
fix transformation and inverse
formatting
formatting
Merge branch 'zabr2'
Merge branch 'fixSabrTrafo'
add test cases
replace macro MINSTRIKE by parameter cutoffStrike in the constructor (with same value as default, no no change of behaviour is implied by this)
Merge branch 'fixSabrTrafo'
Merge branch 'fixVolCube1_minstrke'