FUNCTIONS:
----------
DB_OPEN("dbname")
    Opens database, if succeeds it returns a handle to database, else returns DB statuscode.

DB_SQL(db_handle, "sql string")
    Executes SQL command, returns DB statuscode (1 = OK, 0 = NOK). The SQL results stored in DB_RESULT$, SQL error messages stored in DB_ERROR$

DB_QUERY(db_handle, "sql string", callback)
    Executes SQL command, returns DB statuscode (1 = OK, 0 = NOK). The SQL results are passed to user defined function callback(), SQL error messages stored in DB_ERROR$

DB_CLOSE(db)
    Closes database, returns DB statuscode

DB_STATUS$(db)
    If a returned DB status code is higher than 0, this function returns the status in human readable format


VARIABLES:
----------
DB_FS$
    Field Separator for the results in DB_RESULT$, defaults to tab, can be set to any other string by user

DB_RS$
    Record Separator for the results in DB_RESULT$, defaults to newline, can be set to any other string by user

DB_RESULT$
    Contains last result of SQL command executed by 'DB_SQL'

DB_ERROR$
    Contains last error string of SQL command executed by 'DB_SQL'

DB_VERSION$
    Returns version string of SQLite

-------------
SQLITE SQL syntax here: http://www.sqlite.org/lang.html