Virginia's public colleges and universities will add about 6,000 slots for in-state students this fall, Gov. Bob McDonnell said Thursday as he signed the "Top Jobs" legislation that seeks to more closely align higher education and economic development. About two dozen college students watched the signing of the Higher Education Opportunity Act of 2011, which also will establish metrics for students to gauge the value of their degrees in the workforce.  ... He credited funding incentives in the legislation for the increased in-state slots for the next academic year, including at ...