CSV serialization for result formats of new W3C parsing functions

[GuntherRademacher]

These changes add support for the new CSV parsing result formats to csv:serialize. As for csv:parse result formats, the options that are used at parsing time can be supplied for serialization. For the new functions, these are the options conforming to FnCsvToArrays.CsvToArraysOptions and FnParseCsv.ParseCsvOptions. The actual options class and the serializer implementation are determined by inspecting the first item to be serialized:

Item Type	Options Class	Serializer
element(fn:csv) document-node(element(fn:csv))	FnParseCsv.ParseCsvOptions	CsvXmlSerializer
element() document-node()	CsvParserOptions	CsvDirectSerializer
array(*)	FnCsvToArrays.CsvToArraysOptions	CsvArraysSerializer
record(records, *)	CsvParserOptions	CsvXQuerySerializer
record(*)	FnParseCsv.ParseCsvOptions	CsvMapSerializer

Class CsvSerializer.Delegator has been added to delay this distiction until the first item is presented to serialize(Item).

Test cases have been added in new class CsvRoundtripTest. These have been generated semi-atomatically by adding some temporary code to collect them while executing QT4 tests. The test cases

• do some CSV parsing
• verify that the expected result was returned
• do CSV serialization of the result
• parse the result of the serialization
• verify that the same expected result was returned as was from the initial parsing.

[ChristianGruen]

Incorporated in 105b63a