[UWS] Add a log message filter: only messages whose the level is greater or equal to a given one are displayed. This level is by default DEBUG (meaning all messages are always written).

[UWS,TAP] Add clean release of all resources (e.g. Threads, Timers, DB connections) allocated in a UWS and a TAP service. Small changes of the UWS API...but only if ExecutionManager, DestructionManager and UWS have been implemented by library users rather than using the default implementation.

[UWS,TAP] Review some log messages (in the log file but also in the error summary of a job) ; particularly stack traces are added into the error summary, but are displayed just once in the logs.

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