changin four to trig begins.
renaming the test folder.
constructor for trigtech now works
some other tests pass as well.
diffmat now passes.
most tests in trigtech now pass.
All trigtech tests pass!
starting changes at higher levels
most @chebfun tests pass
All @chebfun tests pass.
making various changes from four to trig.
All tests pass, fourtech is now trigtech.
starting to rename fourcolloc to trigcolloc.
renmaing of fourcolloc to trigcolloc done, tests not modified yet.
All tests pass, fourcolloc is now trigcolloc
adding a trig option also
Merge remote-tracking branch 'origin/development' into fix-trig

Conflicts:
	@chebop/solvebvp.m
Change FOUR to TRIG in files from branch feature-eigs-periodic.
Forgot to modify several tests. And one item in trigtech/restric.
Changed @chebtech/fourcoeffs to @chebtech/trigcoeffs.