Returns the release type of the most recent version of the package compared
to the installed version. The result will be one of
PEAR_PACKAGEUPDATE_TYPE_MAJOR,
PEAR_PACKAGEUPDATE_TYPE_MINOR, or
PEAR_PACKAGEUPDATE_TYPE_BUG.
This value is used to determine if the user's preferences allow an update
for the current release.
Note
Cette fonction ne peut pas être appelée de façon statique.
