#134840 Missing quotes causes parsing error with php5. Thanks to Cloudy for pointing out the solution.

Bugfix: the SQL queries were not adequately updated after the change of schema, in the volume navigation.

#112332: outline.module does not define any node type, and the $volume_id is not related to $node->nid.
This way the logic is different in quite a few places.
This patch corrects what have become bugs given the new logic, when setting the node outline options.

A first big patch, after changing the DB schema to two tables.

Main changes:
* A volume is not a node, but the definition of a group of nodes.
* Added a volume creation/update form in the volume_outline tab.
* Since a volume is potentially independent from any node, I added a "title" field in {outline_volume}
* Created <default> setting for nodes in volume for child_node_type and toc_depth : the volume's default value will be used.
* Much of the logic is different from the one used with one table only.

TODO:
* volume navigation is broken.
* Test all the forms in the volume_outline tab. I have noticed some interference when updating a node, another node from another volume got affected!

* created 'administer outlines' permission.
* fixed the administer outline settings permission.

* wrong indentation in settings.
* location of the setting page.
* we do not need to define a default node type.
  The cover page for each volume can be of any type, depending on the use made of the volume.

#106052 We are back to a two-table structure, so that we can define the attributes of a whole volume.

so we can remove the sql query checking for whatever it was checking. :-/


Also, a major difference with the original book.module PATCH,
it is that there is not book_cover node type specifically declared.
The volume cover will now be the first node to be top-level within the volume.
There could be more than one node at the top level within the volume.

Of course, the webmaster can have only one top-level node for a volume,
and that top level node be different from the other nodes within the module:
this way the volume has a specific volume cover.

And a high level of flexibility is maintained.

Minimum changes so that book.module and outline.module can be enabled at the same time.

The aim is to strip the book node type definition, but to keep and improve the outline function,
based on beginner's and pwolanin's patch here: http://drupal.org/node/65319 and http://drupal.org/node/81226 .
TODO:
  replace book_hooks() into outline_hooks().
  replace {book} into {volume}
  remove book node type definition
  make outline function more general.