Session patch for ID created by handler

I am submitting a patch that will enable a session handler to override the default session id creation routine. This will help extensions like srm and msession. It adds a new member to the ps_module structure and defines a default if it is not overridden. session.c is also changed in that the module is initialized before the creation of the sesson ID Mark

Attachment: [text/x-diff] session.sid.patch