Checks whether or not the user's preferences allow an update to the latest
version of the package. The user's preferences may define restrictions such
as: don't update at all, don't update until a new version has been released
(remembers the last version asked), only ask for certain states such as
beta or stable, only ask for minor or higher version updates (no bug fixes),
or only ask for major version updates.
Note
Cette fonction ne peut pas être appelée de façon statique.
Valeur retournée
boolean - TRUE if the user's preferences allow an update for the
latest version of the package.
