Bisection mode

- 0: all the ranges of the variables are bisected at their middle point. Hence new boxes are created after the bisection process. This is a mode that has to be avoided
- : a single variable will be bisected. The choice of the
bisected variable will depend on the the value of
``ALIAS/single_bisection`variable: see the C++ manual for the possible values of this variable - 20: you have defined your own bisection procedure. This
procedure should be written in the file
`BISSECTION_USER.C`which must include the procedureint Select_Best_Direction_Interval_User(int DimVar,int DimEq, INTERVAL_VECTOR (* TheIntervalFunction)(int,int,INTERVAL_VECTOR &), INTERVAL_VECTOR &Input)

where`DimVar`is the size of the unknown vector,`DimEq`the number of equations,`TheIntervalFunction`the evaluation function of your problem (by default`F`)and`Input`the current box. This procedure shall return the variable number that will be bisected. - a mix of these 2 modes in which ranges among the
available will be bisected.
``ALIAS/mixed_bisection`. gives the number of bisected ranges