Merge github.com:ChristophBerg/pgdg-buildenv

diff --cc .gitignore
index 4006c9158d607786db01550ff662176bcb573227,077f211ae12fe8bbb9e39b02d056f43a8d53cebd..69d3b7a576ce1e8d2fc81db98418473d75a5f221
--- 1/.gitignore
--- 2/.gitignore
+++ b/.gitignore
@@@ -1,5 -1,4 +1,10 @@@
 +repo/conf/modules-packages
 +repo/conf/postgresql-packages
 +web/*.html
 +
 +.*.swp
++
+ debian/files
+ debian/pgdg-buildenv/
+ debian/*.log
+ debian/*.substvars