02/03/04 - Added sqlite system tables sqlite_master and sqlite_temp_master to
the table list etc.
02/03/04 - Changed default string size to 0, which is unlimited.
22/03/04 - Cleared up some deallocations.
22/03/04 - Allowed for accessing same field name within multiple table
           query. e.g. select fred.id, sid.id from fred, sid
01/04/04 - Enabled Field aliasing for exec.
03/04/04 - The host variable within the database class can be used as the
           database home, that is, set it to the path where the database files
           are located.
03/04/04 - The location of the database files is order by:
           a) If fullpath given then use this.
           b) If Host variable set, then look at the path set in the variable.
           c) If environment variable GAMBAS_SQLITE_DBHOME is set then use.
           d) Current working directory.
04/06/04 - Allow memory only database. e.g. :memory: as the database name.

* 17 Jul 2004 - BM

- By default, an in-memory database is opened if no database name is specified.
- An in_memory database returns as user-list only the current user, with admin rights.
- The databases are not searched by default in the current working directory anymore. 
  Instead, they are searched in the /tmp/gambas.%pid%/sqlite/ directory.
  
* 29 Aug 2004 - BM

- Many clean-ups in database_create(). The function FullPath() is not necessary
  anymore, and has been removed.
- Fix table_index() so that it returns error if no true primary key is found
  in the table.
  
* 01 Sep 2004 - NG
  
- Checks that a full path points at a real SQLite database in FindDatabase().

* 20 Nov 2004 - DC

- I've replaced all float values for double values in the sqlite driver.