[GRASS5] Schema in db string

[Radim Blazek]

It is now possible to specify schema in database definition for 
postgres. for example:
db.select table=viapri driver=pg database="dbname=mydb,schema=myschema"

The value set byt db.connect schema= cannot be used directly by driver, 
because it can collide with connection of vector. I am not sure how to 
handle schemas in general.

The same should be done for mysql, I don't have mysql running.

Radim