Replaces min, max, minimum, mean, maximum and extrema with NaNMath versions in places where NaNs can occur.
To avoid returning NaN when there are NaNs in the Vector
* Also add maximum and minimum
* define _-prefaced versions of mean, maximum, minimum, extrema
* variable arg numbers for Base methods
* Different implementation of the override
* remove underscore from 2-arg versions of maximum
* some forgotten extrema -> _extrema
* Fix bug in _extrema definition
* edit comment
* replace min and max with _min and _max
* Base NaN-compliant functions on NaNMath
replace _min and _max with NaNMath versions
* Use NaNMath explicitly everywhere
* remove unneccesary NaNMath calls
* Ensure ceil does not error on NaN
* Added one more maximum in gr
d29df4289e