Functional display of sheet, working on updates

 * set internal "id" field if specified when calling load()
 * ability to retrieve skills based on a particular ability
 * skill modifier is properly calculated
 * ability to retrieve ability list (get_all_abilities()) indexed by ID
 * csbt_ability::get_sheet_data() overloaded modifiers can be calculated
 * schema modification, primary stats can be built from block rows
 * remove some debug JS code
 * updated templates for:
	-- better dynamic highlighting of related values
 	-- template rows for stats block
	-- readability