[ADQL,TAP] New parser for ADQL-2.1.
- Now, `ADQLParserFactory.createParser(...)` should be used to create a parser - Only the new function `LOWER` is supported for the moment - Not yet possible to manage the optional features _(next dev to come)_ => 1st step for ADQL-Lib v2.0 - TAP adapted so that using the last stable version of the ADQL language (i.e. 2.0 for the moment) - but not yet possible to set the ADQL version to use in the configuration file