ChangeMatrix -- whether to produce the change of basis matrix

Description

Functions with optional argument named ChangeMatrix :

• forceGB(..., ChangeMatrix => ...) -- inform Macaulay2 about the change of basis matrix from GB to generators
• gb(..., ChangeMatrix => ...)
• hermite(..., ChangeMatrix => ...)
• LLL(..., ChangeMatrix => ...) -- also find change of basis matrix
• smithNormalForm(..., ChangeMatrix => ...) -- missing documentation
• syz(..., ChangeMatrix => ...) -- whether to produce the change of basis matrix