Fix issue with bias component in _v() (pattern.text)
Fix issue with bias component in _v() (pattern.text)

This fixes a bug introduced in dc855341aadea1ed56413bb2c1d8f611ff714a48 which causes the majority of unit tests in pattern.en (test_en.py) to fail.
Resolves #182.

clips/pattern,clips/pattern,clips/pattern