(calc-dumb-map): Declared it.

(calc-dumb-map):  Declared it.
(calc-graph-show-dumb):  Check if calc-dumb-map is non-nil rather than
unbound.

(calc-graph-name):  Made `end' a local variable.

(calc-graph-lookup):  Made `varname' a local variable.

(var-DUMMY, var-DUMMY2, var-PlotRejects, calc-gnuplot-trail-mark):
Declared them.
(calc-graph-format-data):  Don't check if var-PlotRejects is bound.

(calc-graph-plot, calc-graph-compute-3d):  Removed references to the
unused variable y3vec.

(calc-graph-show-dumb):  Removed reference to unused variable found-pt.

(calc-graph-kill-hook, calc-graph-plot):  Removed reference to
calc-graph-prev-kill-hook.

(calc-graph-yvalue, calc-graph-yvec, calc-graph-numsteps,
calc-graph-numsteps3, calc-graph-xvalue, calc-graph-xvec,
calc-graph-xname, calc-graph-yname, calc-graph-xstep,
calc-graph-ycache, calc-graph-ycacheptr, calc-graph-refine,
calc-graph-keep-file, calc-graph-xval, calc-graph-xlow,
calc-graph-xhigh, calc-graph-yval, calc-graph-yp, calc-graph-xp,
calc-graph-zp, calc-graph-yvector, calc-graph-resolution,
calc-graph-y3value, calc-graph-y3name,
calc-graph-y3step, calc-graph-y3step, calc-graph-zval,
calc-graph-stepcount, calc-graph-is-splot, calc-graph-surprise-splot,
calc-graph-blank, calc-graph-non-blank, calc-graph-curve-num):  New
variables.
(calc-graph-plot, calc-graph-compute-2d, calc-graph-refine-2d)
(calc-graph-recompute-2d, calc-graph-compute-3d, calc-graph-format-data):
Replaced undeclared variables with the above declared variables.