[TAP,UWS] Make valid VOTable results and errors. Some error messages about expected TAP request parameters have been changed.

[TAP] Fix MAXREC bug (maxrec was ignored if = 0) & Replace the MIME type for VOTable output from 'text/xml' to 'application/xml'

[UWS,TAP] Review the exceptions and logs management + Add log file rotation (with a configurable rotation frequency)

[TAP] Replace Savot by STIL + Change datatype management in TAPColumn (vot-type is no more available from here), TAPType (no votable type inside it) and VotType (can now be created from a TAPType instance + a VotType instance can be converted easily in a TAPType object)

[TAP] Remove all generic types + Delete specific (for ResultSet) output formatters + Modify the main output formatter

[TAP] Rename TAPMetadata.TableIterator into TAPMetadata.TAPTableIterator (it iterates only on the content of a TAPTable object and not on a data table. + Typos