add pamac-cache-clean and save cache options

data/config/noaur/pamac.conf

@@ -9,3 +9,9 @@ RefreshPeriod = 6
 
 ## When there are no updates available, hide the tray icon:
 #NoUpdateHideIcon
+
+## Number of versions of each package to keep in the cache:
+KeepNumPackages = 3
+
+## Remove only the versions of uninstalled packages when clean cache:
+#OnlyRmUninstalled

data/config/pamac.conf

@@ -24,3 +24,9 @@ BuildDirectory = /tmp
 
 ## Do not ask for confirmation when building packages:
 #NoConfirmBuild
+
+## Number of versions of each package to keep in the cache:
+KeepNumPackages = 3
+
+## Remove only the versions of uninstalled packages when clean cache:
+#OnlyRmUninstalled

data/systemd/pamac-cleancache.service

@@ -3,4 +3,4 @@ Description=Clean packages cache
 
 [Service]
 Type=oneshot
-ExecStart=/usr/bin/paccache -r
+ExecStart=/usr/bin/pamac-clean-cache