[Bug-apl] window caption for aplplot

[Juergen Sauermann]

Hi Chris,

I have added a new option plwindow to aplplot, see first patch. It sets the window
caption of the plot window. It is handled before the option parser in order to allow UTF8 texts (like APL primitive
names) in the window caption.

For normal ASCII captions that should be it. For UTF8 captions you may (depending on your platform) need to
recompile libplplot with the second patch that makes X display the  window caption properly.

/// Jürgen

aplplot.cc.diff
Description: Text Data

cairo.c.diff
Description: Text Data