[changeset] make lower and upper aliases of tolower and toupper

[Thorsten Meyer]

Hi,

here is a changeset that makes the lower and upper functions aliases of tolower and toupper
respectively (and adds a few tests for tolower and toupper):
tolower and toupper can handle cellstrings themselves now. The only remaining difference between
tolower and lower is, that lower was more restrictive with respect to the input arguments: lower
accepts only cellstrings and character arrays, while tolower will take almost anything.

Thorsten
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