Moved all DB "classes" out of functions.php

Moved all DB classes out of functions.php and into their own files.
In addition, moved all files into a db folder for better organizing.
Each database table will now have its own file in the db folder and
will be included within the db/db.php file that way all table
functionality will be exposed at one time.  Also all database
connection passing was moved out of individual functions and into that
classes constructor.  Removed all static functions.
Fixed formatting
Updated version to 1.4.0
Updated DB class references
Updated DB class references
Now checks to see if an install exists beforehand
Updated all files to reference new DB classes

All files have been updated to use the new DB classes where each table
has its own class.  All static DB functions have been removed.  In
addition, the database connection class is now only passed to the DB
constructor class for each table, instead of being passed to each
DB function.
Moved all DB classes into their own files
Updated all files to use new DB references
Updated files to use new DB references
Updated file to use new DB references
Updated all static DB references

All static classes now use their new DB references.  In addition, added
the _Get_Tables function which returns an array of tables in the
schema.
Now includes db/db.php which holds all the DB classes
Now returns an error when mail fails to send