minor changes in the documentation of CharacteristicClasses
Fixed Documention
minor changes in documentation
Merge branch 'master' of https://github.com/ChristineJost/M2
Merge branch 'master' of github.com:Macaulay2/M2
update ntl to version 6.1.0 (from 5.5.2)

See https://github.com/Macaulay2/M2/issues/147
stop setting GC_FREE_SPACE_DIVISOR to 12

-- resulting speed up by a factor of 2.5 on some simple tests
that allocate lots of small chunks of memory in the interpreter.