Also move mariadb buildout instance profile to dynamic template.

{{- parameters.project_public_folder -}} prevents newline.

Let the supervisord of slaprunner managing the instance processes
be managed by supervisord of slapos node.

Fixes problems of process like supervisord escaping control.

Also remove unused variable in nginx-conf.

Also unpin slapos.Cookbook.
Related problem with Jinja2.7 has been fixed in slapos.recipe.template 2.5.

Informations about what failed and what succeeded.

Side effect: activate binlogs.
current backup system does not work.

+ make promise checking this

Import script of webrunner asks stop of all instances, runs slapos, runs
consistency checks, runs scripts, ask start of all instances.

Allows HOME to be easily referenced in some cases where buildout:directory is not available.

Allow to lint/edit/develop more easily the bash script without having tons of template parameters.