Code adjustments for pacman-4.1 API changes
kalu-dbus: Use new caller prefix with alpm_logaction()
kalu-dbus: optional dependencies are now alpm_depend_t* instead of char*
Add support for new event ALPM_EVENT_OPTDEP_REQUIRED
kalu-dbus: Add note about why we ignore ALPM_EVENT_DATABASE_MISSING
Add progress for "checking keyring"
Add message for EVENT_KEY_DOWNLOAD
Fix event retrieving-pkgs: only one, instead of one per repo
Add support of events for downgrade & reinstall
Parse UseDelta value in locale-independent way

strtod() is locale dependent, but reading the config should always be done
regardless of user's locale. (See FS#34253)