Miscellaneous fixes for better compatibility with

Miscellaneous fixes for better compatibility with
XEmacs 19.12.

(ps-plot-with-face): Added code to handle Emacs
19.29's new ability for the face attribute to hold a list of
faces.

Rolled in Chuck Thompson's changes to make color
printing work in XEmacs 19.12.

Fix error in comments.

(ps-generate-postscript-with-faces): Add fix to
handle extents without faces.

(ps-faces-list): deleted.  Added alias for
list-faces if face-list isn't fbound.

(ps-print-ensure-fontified) added to make sure
ps-print works correctly in conjunction with lazy-lock.

RMS's changes for Emacs.