[horde] Datatree, sybase and horde sql drivers

[François Helly]

Hi all

If you are using particular DBMS as backends for datatree or auth for 
instance,
take care of DB portability options

try to set DB_PORTABILITY_ALL in the connection function, it would 
solve some problems

Examples :

With Sybase (ASE 12.5) :
- values must be trimmed,
- null and empty values have to be filtered (same as oracle).


Francois