Removed the auto-refresh feature

This feature just generated a lot of unnecessary traffic to the server and
hurt usability because the page would refresh unexpectedly while a user was
actively looking at content.  Fixes #1003, #1179, #729.
Did not remove the column for that setting in the user database, since that
would lead to complications if needing to downgrade for some reason.

airsonic-main/src/test/java/org/airsonic/player/dao/UserDaoTestCase.java

@@ -194,7 +194,6 @@ public class UserDaoTestCase extends DaoTestCaseBean2 {
         assertFalse("Error in getUserSettings().", userSettings.isNowPlayingAllowed());
         assertSame("Error in getUserSettings().", AvatarScheme.NONE, userSettings.getAvatarScheme());
         assertNull("Error in getUserSettings().", userSettings.getSystemAvatarId());
-        assertEquals("Error in getUserSettings().", 0, userSettings.getListReloadDelay());
         assertFalse("Error in getUserSettings().", userSettings.isKeyboardShortcutsEnabled());
         assertEquals("Error in getUserSettings().", 0, userSettings.getPaginationSize());
 
@@ -217,7 +216,6 @@ public class UserDaoTestCase extends DaoTestCaseBean2 {
         settings.setAvatarScheme(AvatarScheme.SYSTEM);
         settings.setSystemAvatarId(1);
         settings.setChanged(new Date(9412L));
-        settings.setListReloadDelay(60);
         settings.setKeyboardShortcutsEnabled(true);
         settings.setPaginationSize(120);
 
@@ -243,7 +241,6 @@ public class UserDaoTestCase extends DaoTestCaseBean2 {
         assertSame("Error in getUserSettings().", AvatarScheme.SYSTEM, userSettings.getAvatarScheme());
         assertEquals("Error in getUserSettings().", 1, userSettings.getSystemAvatarId().intValue());
         assertEquals("Error in getUserSettings().", new Date(9412L), userSettings.getChanged());
-        assertEquals("Error in getUserSettings().", 60, userSettings.getListReloadDelay());
         assertTrue("Error in getUserSettings().", userSettings.isKeyboardShortcutsEnabled());
         assertEquals("Error in getUserSettings().", 120, userSettings.getPaginationSize());