Do not zero coeffs in PLOTCOEFFS. Closes #900.
Add a barplot option to PLOTCOEFFS().
Merge remote-tracking branch 'chebfun/make-nh-happy' into feature-chebpolyplot-bar
Some tidying of barplot.
minor improvements in help text
Merge pull request #945 from chebfun/feature-chebpolyplot-bar

Feature chebpolyplot bar