[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] Update the ANT script (due to the replacement of Savot by STIL).
[TAP,ADQL] Improve and remake a part of the database connection. Missing javadoc has been added when missing in the modified tables.