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Use a generic one instead, by default, for all the types that don’t need any
special treatment to be converted.

applied patch #18 by Max Brain <maxbrain@users.sf.net>: In postgreSQL type "double" have name "double precision". So we need to override method PostgreSQL::getSQLType

factored out void writeObjFieldValues()

instead of call by value for string vectors

made some methods const

Because I can’t test them, so I prefer to remove these things instead of
having broken stuff.  Also I don’t understand what they do.