Log Message:
Add compface 1.4: 48x48x1 image compression and decompression (X-face utility)

The programme (two programmes really - but they're just links to each
other) converts 48x48x1 images to and from a compressed format.  The
uncompressed images are expected to contain 48x48/4 (576) hex digits.
All other characters and any `0's followed by `X' or `x' are ignored.
Usually the files are 48 lines of "0x%04X,0x%04X,0x%04X,".  The
compressed images contain some number of printable characters.  Non
printable characters, including ` ' are ignored.  The purpose of the
programme is to allow the inclusion of face images within mail headers
using the field name `X-face: '.

Submitted by Osamu OISHI <oishi@alef.ims.ac.jp> in PR 17541