Revert "Revert "Revert "La insercio d'un usuari ja funciona mitjançant la finestra UserWindow"""

This reverts commit 6cd4e1ec38f202635b8a8988e911e5020a49ec1f.
Revert "Revert "Revert "Revert "La insercio d'un usuari ja funciona mitjançant la finestra UserWindow""""

This reverts commit ff82f6caa66f1d0cf8d7d85381e53ca9197875c0.
Merge branch 'master' of https://github.com/SwingTeam/PAC4