[ADQL] Remove useless Javadoc (no custom javadoc for files automatically generated from the JavaCC grammar)
[UWS] Remove commented old code.
[UWS,TAP] Fix timestamp format. Now, each returned date will expressed in UTC and using the ISO8601 format. Any given date is also expected in UTC (or with a time zone offset) and in ISO8601Format. These rules apply also for uploaded tables and for timestamp columns in a query result.
[UWS] Make XML representation of jobs and joblists valid (with their XML schema), and particularly the nodes jobs, job and the error type (which should be written in lower-case).
[TAP] Make XML capabilities document valid.