Use JAS version 2.6.5961

[axkr]

Use latest JAS version 2.6.5961.

See:

• Sometimes FactorAbstract#factors() never stops kredel/java-algebra-system#8

changes:

• use TermOrderByName.INVLEX instead of TermOrderByName.Lexicographic

• GenPolynomial#quotientRemainder() kredel/java-algebra-system#9

changes:

• changed IExpr.toZERO() to call PossibleZeroQ[] in JAS environment.
• in PolynomialQuotientRemainder use ExprPolynomial#quotientRemainder()