Implemented application login.

Minor UI improvement.
Fixed memory leaks.

core/context.cpp

@@ -15,6 +15,11 @@
 #include "roles/roles.h"
 #include "permissionservice.h"
 
+Context::~Context()
+{
+    this->destroy();
+}
+
 Context &Context::instance()
 {
     static Context ctx;
@@ -91,7 +96,10 @@ void Context::destroy()
         m_dbOpened = false;
     }
 
-    delete m_settings;
+    if (m_settings != NULL && m_settings->parent() == NULL)
+    {
+        delete m_settings;
+    }
 
     foreach (IPlugin *plugin, m_plugins)
     {
@@ -112,6 +120,16 @@ Context::Context()
     m_dbOpened = false;
 }
 
+QSharedPointer<User> Context::currentUser() const
+{
+    return m_currentUser;
+}
+
+void Context::setCurrentUser(const QSharedPointer<User> &currentUser)
+{
+    m_currentUser = currentUser;
+}
+
 void Context::checkDb(const QString &path)
 {
     {
@@ -226,4 +244,6 @@ void Context::checkPermissions()
             }
         }
     }
+
+    permService.checkForAdmin();
 }