Updated webform_book table schema to include book nid.
Altered default page table to use theme_table()'s empty property.
Added install and uninstall functions.
Added webform book admin form.
Added webform book selection to the assessment add/edit form.
Added system for activating self-assessments.
Added activation checkbox to the assessment add/edit form.
Fixed a couple of comments.
Added hook_webform_submission_insert(). Added webform_book_index schema. Cleaned up webform_book schema.