#****o* ./QPotential
# NAME
#  QPotential
# 
# USAGE
#  Option for QPlotPot
#
#   QPotential -> "constant" piecewise constant potential
#   QPotential -> " linear"  piecewise linear potential 
#
# The modules of the transfer matrix method can be extended to piecewise linear potential. Therefore
# QPotential contains already this option. Piecewise linear potnetials are not implemented yet.
#***