debug R device plot

You need to look for a file (it may not be in your project directory) that
contains "___LOCK" in its file name and delete it.

Specifically, the rogue lockfile should be in the same directory as
options('tikzMetricsDictionary'). Or, if you haven't set a permanent
location for the metrics dictionary, it will be in a temporary directory.
The tikzDevice prints out a status message with the location of the
temporary dictionary whenever it has to create one.

-----
Charlie Sharpsteen
Undergraduate-- Environmental Resources Engineering
Humboldt State University
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