Revert "Updagres pg module"

This reverts commit d418db03e41779be2bdf1aab5067cd7e7948d12b.

The problem we were after was elsewhere.
Upgrading pg module may still be a good thing but needs to be
done togheter with generic-pool and also needs updates to
shrinkwrap file
Add test for multi-statement and begin/commit
Bump version to 1.3.6
Merge branch 'release/staging' into develop
Do not confuse warnings with errors on shapefile output

Closes #87
Merge branch 'release/staging'