wmbattery: Remove debian directory.

wmbattery was previously a Debian native package.  The debian directory should
no longer be included in the upstream source.
wmbattery: Add ChangeLog (renamed from debian/changelog).

Since wmbattery was previously a Debian native package, all the changes were
documented in debian/changelog.  Since the debian directory has been removed in
the upstream source, this file is being renamed to ChangeLog in the root
directory.
wmbattery: Remove unnecessary .gitattributes file.

The only attributes given were to debian/changelog, which no longer exists.
wmbattery: Escape hyphen in manpage.
wmbattery: Avoid uninitialized variable warning.

Move assignment of old_status until after cur_info is initialized in
wmbattery.c.
wmbattery: Remove config.h.in; automatically generated by autotools.
Import upstream release (git snapshot) version 2.44+20140921.