Resalloc v4.8

New in v4.8:

• New features:

  • Better logging support: Exceptions are logged to 'main.log', the
    default log_level=info is made useful, more readable messages, log
    entries contain PID, TID and thread name.

  • Stopped using 'sqlalchemy.pool.NullPool' for connecting to database,
    and use the default. That is NullPool anyway for SQLite backend, and
    QueuePool(pool_size=5) for the PostgreSQL backend:
    https://docs.sqlalchemy.org/en/14/core/pooling.html#sqlalchemy.pool.NullPool

  • A new PostgreSQL index to speedup resalloc-maint ticket-list command.