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Type of the functions

The i-th value
in the array of integers `Type_Eq` enable one to indicate if
function is an equation or an inequality:
`Type_Eq`(i)=0 : must verify
`Type_Eq`(i)=1 : must verify
`Type_Eq`(i)=-1 : must verify

For all the general solving algorithms the integer
`ALIAS_Pure_Equation` is set to the number of equations in the
constraints list.

Jean-Pierre Merlet
2012-12-20