This updates the tests to consistently make use of the helper methods
that parse hex to 10x26 field vals and panic if they represent invalid
values.

Since some of the tests intentionally involve values that overflow the
max allowed value, the helpers are reworked slightly to either allow
overflow or not and all tests are updated accordingly.

Finally, it renames the helpers that panic to the more canonical mustX
scheme.

This updates the tests to consistently make use of the helper methods
that parse hex to 4x64 field vals and panic if they represent invalid
values.

Since some of the tests intentionally involve values that overflow the
max allowed value, the helpers are reworked slightly to either allow
overflow or not and all tests are updated accordingly.

Finally, it renames the helpers that panic to the more canonical mustX
scheme.

This updates the tests to consistently make use of the helper methods
that parse hex to mod n scalars and panic if they represent invalid
values.

Since some of the tests intentionally involve values that overflow the
max allowed value, the helpers are reworked slightly to either allow
overflow or not and all tests are updated accordingly.

This removes a few 10x26 field tests that aren't actually testing
anything related to the associated methods because they involve
unreduced outputs which are impossible.

The outputs are necessarily reduced when they are parsed by the test
code which mean, at best, it's testing a few isolated cases of parsing
reduction, but that is explicitly tested much more thoroughly elsewhere.

This removes a few 4x64 field tests that aren't actually testing
anything related to the associated methods because they involve
unreduced outputs which are impossible.

The outputs are necessarily reduced when they are parsed by the test
code which mean, at best, it's testing a few isolated cases of parsing
reduction, but that is explicitly tested much more thoroughly elsewhere.