Upgraded from WARNING to ERROR the situation where the m-tuples are not correctly ordered from smallest position to largest position. Updated the documentation of ignore_first_n_bases() and ignore_last_n_bases() to reflect the previous commit.
Upgraded from WARNING to ERROR the situation where the m-tuples are not correctly ordered from smallest position to largest position. Updated the documentation of ignore_first_n_bases() and ignore_last_n_bases() to reflect the previous commit.

PeteHaitch/methtuple,PeteHaitch/methtuple,PeteHaitch/methtuple