description:
Alters the labels in an mpl file, composing new labels from the old labels, from those in another
file, or using new labels supplied on the command line.
files: inputfile contains the data set to be relabeled. If outputfile is supplied, the relabeled
data set is placed in this file. Otherwise, the original file is overwritten.
options:
from_file
Specifies the name of a file from which to read the labels. If no other option is supplied,
these labels are the new ones for the data set in inputfile.
xlabel, ylabel, title, topline
These options specify composition of the individual labels. For the most part, the string
is simply copied. However, if the sequence %1 appears in the string, it is replaced by
the original corresponding label from inputfile. Similarly, if the sequence %2 appears, it is replaced
by the corresponding label from the file named with the from_file option.