Commit [r12705] Maximize Restore History

Several different functions in plbox incorrectly assume that the

PLplot string escape character is '#'. Fix that assumption by
implementing a small static function that returns the string (not
integer code) corresponding to the current escape character, and use
that instead.

(Lightly) tested by: Alan W. Irwin <airwin@users.sourceforge.net> on Linux
by running a run-time test where

plsesc( '@');

was called in example 1 and showing that no longer interfered with
the exponent used on the viewport Y label axis for one of the
plots.

airwin 2013-11-16

changed /trunk/src/plbox.c
/trunk/src/plbox.c Diff Switch to side-by-side view
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