wftk core: datatype adaptor

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A datatype adaptor allows the wftk to use complex semantics for data values; all data is stored as strings in the underlying XML (well, unless it's stored somewhere else in a data store, but it has to go through string formatting in the XML) -- but those strings may represent any number of things, such as dates. A datatype adaptor will do formatting of data-entry HTML and at some point might be cleverer (incrementing or adding or something?)

These are the functions exposed by a datatype adaptor:
0: init   Initialize adaptor instance
1: free   Clean up instance before shutting down
2: info   Return XML describing the adaptor
3: html XML * datasheet
XML * data
Format a field for input
2: info XML * datasheet
XML * data
Return a blank field format


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