fix setup/debian build/version

debian/control

@@ -1,21 +1,14 @@
 Source: calcool
+Maintainer: Jan Gerber <j@mailb.org>
 Section: python
-Priority: extra
-Build-Depends: cdbs (>= 0.4.43),
- debhelper (>= 6),
- python (>= 2.6.6-3~),
- python-distutils-extra (>= 2.10)
-Maintainer: j^ <j@mailb.org>
-Standards-Version: 3.8.2
-XS-Python-Version: current
+Priority: optional
+Build-Depends: python3-all, python3-distutils-extra, debhelper (>= 7.4.3), dh-python
+Standards-Version: 3.9.1
 
 Package: calcool
 Architecture: all
-XB-Python-Version: ${python:Versions}
-Depends: ${misc:Depends},
- ${python:Depends},
- python-gtksourceview2,
- python-gtk2
+XB-Python-Version: ${python3:Versions}
+Depends: python3, ${misc:Depends}, ${python3:Depends}, gir1.2-gtksource-4
 Description: A document based calculator tool
  Calcool allows you to do calculations in a document, on the right you
  have the result for each line. If you ever used bc and wanted to edit a