wmppp.app: Remove getmodemspeed binary from source.
wmppp.app: Remove trailing whitespace.
wmppp.app: Add manpage (obtained from Debian package).
wmppp.app: Rename system wide fixed options configuration file for consistency.
wmppp.app: Allow ISDN devices.

Users of ISDN dialup lines (such as me) cannot use wmppp as shipped,
because it rejects to use any device except those beginning with `ppp'.

The patch attached solves this.

Based on the patch by Juan Cespedes <cespedes@debian.org>.
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=97509.
wmppp.app: Stampfile handling.

This patch adds support for "stampfile" in config file, as described in
manual page.

Based on the patch by Juan Cespedes <cespedes@debian.org>.
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=97509.
wmppp.app: Display speed in K when too high.

When the download speed is too high, wmppp can't display it because it has
only 5 digit. The most significant digits are hidden !

This small patch display the speed in K when it is too high.

Based on the patch by jguiton <jguiton@free.fr>.
See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=328699.
wmppp.app: Use rm -f for make clean

This patch prevents "make clean" from failing when the source tree is already
clean.
wmppp.app: Use build flags.

Compile with CPPFLAGS and LDFLAGS and append, rather than overwrite, CFLAGS.

This enables the Debian package to be built with hardening options.  See
https://wiki.debian.org/Hardening.
wmppp.app: Update support email address and webpage.