added some tests to make sure the code really does work with the
relaxed interface.

a copy by value.

for the assignment_function and sequence_labeler consistent.

computed.

missing asserts.

when the user uses the sequence label rejection feature.

svm_c_linear_trainer and svm_c_ekm_trainer objects.  However,
there was a bug which made them only ever do at most 16 iterations,
which is too few to solve many problems.  This has been fixed.