Respect vertical scaling of the input function in plateauCheck.
Fixes to make the vscale work: size and shape, extension to expm and digs.
In a debugging state.
Working V4 convergence tester.
Merge branch 'feature-v4-convergence' into fix-linop-vscale

Conflicts:
	@chebtech/plateauCheck.m
Switched over to the V4 convergence, and all tests pass.
Merge branch 'development' into feature-v4-convergence

Conflicts:
	@chebtech/plateauCheck.m
Merge branch 'development' into fix-linop-vscale

Conflicts:
	@linop/eigs.m
Merge branch 'feature-v4-convergence' into fix-linop-vscale
Merge branch 'fix-linop-vscale' of https://github.com/chebfun/chebfun into fix-linop-vscale
Columnwise scaling working with all tests.
Convergence is still checked column wise, but with a global scale that's the same for all columns.
Merge branch 'development' into fix-linop-vscale

Conflicts:
	tests/chebop/test_scalarODE_damping.m
Fixed bug in chebpolyval if degree in x \neq degree in y.
Add test.
Adding CHEBMATRIX/MRDIVIDE(), RDIVIDE(), and TIMES().
Adding CHEBMATRIX/SEMILOGY and related.
Adding a CHEBMATRIX/NUM2CELL() method.
Adding MIN and MAX method for the CHEBMATRIX class.
Add TODOs.