removed docservers-path support
Explicitly provide slapos.recipe.maarch
Sanitize input.

TODO: Would be better to sanitize every parameter at beginning.
Sanitize inputs in apache recipe.

Avoid Nonetype-related errors.
Temporary forbid activation of cache until it is properly tested.
Don't touch to custom conf file if already present
Update frontend documentation.

Explain custom configuration files.
Update apache_frontend documentation.

Mention the setcap solution to allow listening to port 443 and 80.
version up : erp5.util = 0.4.33 and add zodbanalyze.
updated versions
disable thread safe in ghostscript-9.07

because the output seems broken with enabling thread safe.
Merge branch 'erp5-component' into erp5
Merge branch 'erp5' into erp5-z2.13
Merge branch 'erp5'
Merge branch 'master' into erp5-component
refer to master branch
fixed version pinning, use specific commit for the cookbook
Merge branch 'maarch'

Conflicts:
	stack/lapp/buildout.cfg
error message fix
simpler, more robust PBS promise