Upgrade stunnel to 4.55.
updated obsolete ./configure options
removed <= link between apache-php and apache-php-postgres
implemented new instance structure from lamp stack
allow slapuser# to connect as postgres user
replaced reference to mariadb -> postgres
published parameters in instance-postgres-export
support for sql-data-file parameter
replaced _ with - in parameter names
comment to explain dummy exporter
updated md5
removed checkout of recipe.maarch and cookbook
renamed parameter sql-data-file -> maarch-sql-data-file
support for docservers_path parameter
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