MySQL Connection File: Execute MySQL queries and display pagination links

This class can execute MySQL queries and display pagination links.

It can establish a connection to a given MySQL database and perform several types of database access related operations. Currently it can:

- Execute queries that may return results or not
- Get the number of result rows, the last inserted identifier or the number of affected rows
- Get query result rows into arrays
- Display pagination links to browse query result pages
- Generate form select input HTML from query results