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- Set priority to "optional", as recommended for Maemo.
- Fix rules file so it can be used for source packages.

We will now behave friendlier to projects that already have a
debian directory. Also, building a source package will be more
straightforward.

Reviewed-by: kh1

Reviewed-by: kh1

Reviewed-by: kh1

Otherwise, we couldn't sensibly use the device's gdb for debugging.

Reviewed-by: kh1

Reviewed-by: kh1

Reviewed-by: kh1

Reviewed-by: kh1

This will give an additional hint to users that they can and should
adapt the Debian template files.

Reviewed-by: kh1

Reviewed-by: kh1

Reviewed-by: kh1