LFSRCirculant should not ignore sequences of period 1

[ChristophWWagner]

Since sequences of period 1 are also sequences of a certain period (although very short ones), excluding them for the sole reason of their short length is a discontinuity in consistency of unjustified reason. Especially since this effectivelyeliminates the use of the sole primitive polynomial of order 1 (which is $x + 1$), this exclusion should be revoked.