MANIFEST.in gardening

- Include ztk-sources.cfg and ztk-versions.cfg
- (without accidentally including .installed.cfg or .mr.developer.cfg)
- Exclude built Sphinx docs

.gitignore

@@ -12,3 +12,4 @@
 /dist
 /eggs
 /parts
+docs/.build/

MANIFEST.in

 include *.txt
 include *.rst
+include *.cfg
+exclude .*.cfg
 
 recursive-include docs *
 recursive-include src *
 
+prune docs/.build
+
 global-exclude *.dll
 global-exclude *.pyc
 global-exclude *.pyo