Quoting Romain:
> As you can see at https://lab.nexedi.com/nexedi/erp5/blob/master/bt5/erp5_web/ToolTemplateItem/caching_policy_manager.xml
> , caching policy manager often set Cookie in the Vary  header.
> For the CDN, it means that each query on the same URL but with a
> different cookie will never be a HIT, and so, query will always access
> ERP5 backend.

Some people might be confused and think it is paths

"I remember it is something scary ;)"

@jm noticed downloading arhives in tar.gz format was failing. Details are in second patch.

/cc @lab.nexedi.com

/reviewed-on nexedi/slapos!70

fix publish custom frontend url
simplify monitoring connection parameters

/reviewed-by: TrustMe

This causes Cloudooo to not listen anymore.

/reviewed-on nexedi/slapos!75

* now glib is built with our own pcre.
* libsigc++, glibmm, pangomm and atkmm are kept in older version because glibmm >= 2.46 requires C++11 compiler.

  The password and username has to be passed to the others instances and used

Define a simple cache implementation using a Dict (Singleton) to prevent call registerComputerPartition
  multiple times over the sections.

/reviewed-on nexedi/slapos!74