Allowing different ways to make Chebfun2 nonadaptive.
Add help text to chebfun2.m
Improve chebfun2 help text.
Merge remote-tracking branch 'origin/development' into feature-chebfun2-nonadaptivector
Merge remote-tracking branch 'origin/development' into feature-chebfun2-nonadaptivector
Merge pull request #1160 from chebfun/feature-chebfun2-nonadaptivector

Allowing different ways to make Chebfun2 nonadaptive.