Removed corpus2 wrappers from wccl wrappers  (wccl includes corpus2 wrappers from /usr/share/swig1.3/libcorpus)

fix wccl-match and wccl-rules to use the ann reader option instead of manually wrapping sentences with annotatedsentences

It was looking for minimum value and Position::Nowhere is
the smallest you can get value-wise (min_int). So if there was
an empty Match in a vector, first_token for the vector would
always end up returning Position::Nowhere, which was wrong
(empty submatches should've been ignored and Position::Nowhere
returned only if there were no non-empty alternatives).