fix spelling
Merge branch 'master' of github.com:Macaulay2/M2
Merge branch 'master' of github.com:Macaulay2/M2
update licensing comment
udpate ntl licensing documentation
remove uses of Singular's routine "newfactoras"

because version 4 omits it.  It was an experimental routine for
factoring over field extensions expressed as consecutive simple
extensions of the prime field, and didn't work well.
recover test file rawFactorOverTower.m2
merged with M2/master