Fixed few bugs related to login/logout

* Pressing the logout button now brings the setup page up again
* Removing a server and readding one of which the hash of the address
  has a higher value than the previous one does no longer cause the
  application to request a login each time you open it.
* The method for deciding if the user is in setup has been changed. It
  now checks if a page in the pageStack has the property _isSetupPage,
  which works better than manually keeping track of state.

qml/pages/MainPage.qml

@@ -73,7 +73,6 @@ Page {
                         clip: true
                         height: {
                             if (count > 0) {
-                                console.log(collectionType)
                                 if (["tvshows", "movies"].indexOf(collectionType) == -1) {
                                     Constants.libraryDelegateHeight
                                 } else {
@@ -99,7 +98,7 @@ Page {
                                 /*model.imageTags["Primary"] ? ApiClient.baseUrl + "/Items/" + model.id
                                                                  + "/Images/Primary?maxHeight=" + height + "&tag=" + model.imageTags["Primary"]
                                                                : ""*/
-                            landscape: ["Series", "Movie"].indexOf(model.type) == -1
+                            landscape: !Utils.usePortraitCover(model.type)
 
                             onClicked: {
                                 pageStack.push(Qt.resolvedUrl("DetailPage.qml"), {"itemId": model.id})

qml/pages/setup/AddServerPage.qml

@@ -14,6 +14,7 @@ Dialog {
 	readonly property string address: serverSelect.currentItem._address
 	readonly property bool addressCorrect: serverSelect.currentIndex > 0 || manualAddress.acceptableInput
 	readonly property string serverName: serverSelect.currentItem._name
+    readonly property bool _isSetupPage: true
 	
 	
 	acceptDestination: AddServerConnectingPage {

qml/pages/setup/LoginDialog.qml

@@ -35,7 +35,7 @@ Dialog {
 			onAuthenticatedChanged: {
 				if (ApiClient.authenticated) {
 					console.log("authenticated!")
-                    pageStack.replaceAbove(pageStack.previousPage(firstPage), Qt.resolvedUrl("../MainPage.qml"))
+                    pageStack.replaceAbove(null, Qt.resolvedUrl("../MainPage.qml"))
 				}
 			}
 			onAuthenticationError: {