Tree-wide white-space cleanups

* Delete blank lines at end of files.
* Delete white space at end of lines.
* Delete spaces before tab.
* Replace 8 spaces by a tab where it makes sense.
Swap negated if/else constructs

Constructs of the form:

if ! [ ... ]
then
	...
else
	...
fi

can be swapped to avoid the negation. It makes the code easier to read
and slightly faster to run.
There is no reason to keep deprecated debian files in this tree

The debian package is maintained in
git://git.debian.org/git/collab-maint/quilt nowadays.