OpenACS

Notable differences with the classical db_multirow:

- a multirow will always be appended when it already exists. The constraint that the two multirows must have the same columns remains.

- no "if_no_rows_code_block"

- no unclobber

- no subst, do it yourself :-)

- no cache stuff

- support for prepared statements

The remaining behavior has been kept the same, e.g. variables will always be reset to empty string, even if they existed outside of the code block. Compatibility has been checked with knowns idiosyncrasies.

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