Issue #1137526 by eL and AlexisWilke: * Select status of the protected node...

Issue #1137526 by eL and AlexisWilke: * Select status of the protected node field set when editing the node.
* Select whether a node is always protected, is protected by default, or never protected.
* Security fix, avoid saving the global password in clear.
* Added information about the hook_protected_node_hide() callback.
* Fixed the INSERT to include the protected node hint field.
* Added some missing documentation.
* Added support for a node type wide password.