DACARS 2.2(c)

A minor update for version 2.2(a). In this version the internal error
handling system is improved. In stead of the text lines on the upper
line on the screen now nice clear error messages are shown. Also I made
a check if the CLIPPER=F27 variable is set.

No functional changes.

For comments or suggestions please contact me at:

barthoek@worldonline.nl
