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.
Merge branch 'feature-diffmat' into development