table: Change function visibilities to public

These two functions, 'getCurrentTimestamp()' and 'isGUID()' are updated
to be public.  There is actually no good reason for them to be private;
I originally just never antisipated their use outside this class.

I need isGUID() in index.php to help with page routing.  Neither of
these two functions have side effects of any kind nor any unexpected
behavior, so there is no harm in going public.

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