Apply BSD 2 clauses license

...rces/regression/verification/xlang/invalid/Epsilon4.scala

...rces/regression/verification/xlang/invalid/Epsilon5.scala

...rces/regression/verification/xlang/invalid/Epsilon6.scala

...urces/regression/verification/xlang/invalid/IfExpr1.scala

...urces/regression/verification/xlang/invalid/IfExpr2.scala

...rces/regression/verification/xlang/valid/Arithmetic.scala

...esources/regression/verification/xlang/valid/Array1.scala

...sources/regression/verification/xlang/valid/Array10.scala

...esources/regression/verification/xlang/valid/Array2.scala

...esources/regression/verification/xlang/valid/Array3.scala

...esources/regression/verification/xlang/valid/Array4.scala

...esources/regression/verification/xlang/valid/Array5.scala

...esources/regression/verification/xlang/valid/Array6.scala

...esources/regression/verification/xlang/valid/Array7.scala

...esources/regression/verification/xlang/valid/Array8.scala

...esources/regression/verification/xlang/valid/Array9.scala

...sources/regression/verification/xlang/valid/Assign1.scala

...sources/regression/verification/xlang/valid/Choose1.scala

...ources/regression/verification/xlang/valid/Epsilon1.scala

...ources/regression/verification/xlang/valid/Epsilon2.scala