convert all id's to bigint

This patch will convert all id's from int to bigint.

This will help with issue redmine #1903, coping data between different sites is done by assigning each site a set of id's that are unique. To copy the changes for each site we only need to dump the rows with a specific id. Each site is give a range of 1,000,000,000 id's.

In the pecan folder are 2 scripts that will dump the database, and load the database. When loading the database it will remove all elements from the site that is dumped and loaded. It will not remove any of the other elements.