added isOpen()/connectEagerly()/pingDatabase()

- added connectEagerly() that allows to force connection to the DB
 - added isOpen()
 - exposed isOpen()/connectEagerly()/pingDatabase() to DB and
   DatabaseManager

src/orm/db.cpp

@@ -67,6 +67,11 @@ void DB::disconnect(const QString &name)
     manager().disconnect(name);
 }
 
+QSqlDatabase DB::connectEagerly(const QString &name)
+{
+    return manager().connectEagerly(name);
+}
+
 QStringList DB::supportedDrivers()
 {
     return manager().supportedDrivers();
@@ -208,6 +213,16 @@ size_t DB::transactionLevel(const QString &connection)
     return manager().connection(connection).transactionLevel();
 }
 
+bool DB::isOpen(const QString &connection)
+{
+    return manager().connection(connection).isOpen();
+}
+
+bool DB::pingDatabase(const QString &connection)
+{
+    return manager().connection(connection).pingDatabase();
+}
+
 bool DB::countingElapsed(const QString &connection)
 {
     return manager().connection(connection).countingElapsed();
@@ -429,11 +444,6 @@ const QString &DB::hostName(const QString &connection)
     return manager().connection(connection).getHostName();
 }
 
-bool DB::isOpen(const QString &connection)
-{
-    return manager().connection(connection).isOpen();
-}
-
 QVector<Log>
 DB::pretend(const std::function<void()> &callback, const QString &connection)
 {