First attempt at getting aliasing to work in the case where fewer coefficieints are required.  Not quite right yet...
Implemented the Fourier aliasing formula.
Added a test for the aliasing method.
Changed test_roots since to correct for an issue related to the new aliasing formula.
Merge remote-tracking branch 'origin' into fix-fourtech-alias
Tidy.
Merge remote-tracking branch 'origin/development' into fix-fourtech-alias
Increasing tolerances for tests.
Merge pull request #998 from chebfun/fix-fourtech-alias

Fix fourtech alias
Merge remote-tracking branch 'origin/development' into feature-chebpts2