revert Henry Baker's contribution of 2013 July, this breaks test code https://github.com/euslisp/jskeus/pull/100
Merge pull request #35 from k-okada/revert_21

(geo/primt.l,l/common.l) revert Henry Baker's contribution of 2013 July, this breaks test code https://github.com/euslisp/jskeus/pull/100