Reduce time spent in cycling timelevels if there is only one timelevel.

Avoid calling routine that swaps pointers to different timelevels if there
is only one timelevel active for a grid variable. This is an performance
improvement if there are a large number of grid variables (as in the case
of large vectors of grid variables).

Signed-off-by: Peter Diener <diener@cct.lsu.edu>

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