- printf function in Makefile missed second lines of section titles
- remove list of CVS keywords, they are no longer in use

PGPLOT labels may contain control character, which make the total length of
the label string longer than what effectively is to be displayed.

Option flag envelope was set to .true. implicitely be default. Initialize flag
with .false. and set only to .true. if no other option is selected on the
command line.

Let program report actually selected flags.

C++ string variables are of arbitrary size. sprintf is used to assemble header
lines containing fields of different types. strings are not truncated by this
function, possibly causing a format violation. Now the numer of characters to
be transferred is precisely limited.

- replace Hollerith code by string literals
- use proper type propagation

- replace Hollerith constants by string literals
- use proper type promotion

At small receiver distances of the order of one km, single precision is not
sufficient to properly represent the cosine of the distance angle. The cosine
then differs from 1 only in the 8th digit.

If scalco or scalel fields violate the format definition, provide a useful
hint to the user.