Adding DIFFMAT() and CUMSUMMAT() to the trunk folder.
Fix bug in COLLOC1.CUMSUMMAT. Closes #996.
Tidying in COLLOC1.M and COLLOC2.M
Improve input parsing.
Adding tests.
Fix typo.
Fix error and warning IDs in diffmat() and cumsummat().

Also made some minor documentation and style fixes.
Adding simplify step after dividing by a singfun

- singfun/rdivide now matches singfun/times
- updated comment in simplifyExponent
- added test to ensure that rdivide deals with exponents as intended
Fix RADPTS --> RADAUPTS.
Merge branch 'feature-diffmat' into development
Merge remote-tracking branch 'davidgross/fix-singfun-exponents' into development
Tidy SINGFUN/RDIVIDE() a little.
Merge pull request #1 from chebfun/development

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