MainWindow Refactor Part 5 of 5 - TABBED ATHLETES

The final part (and one of the reasons) for the mainwindow
refactoring -- we now support tabbed athletes rather than
having a new mainwindow for each athlete opened.

Context is saved/restored and there are new functions for
opening and closing tabs and windows of tabs.

The tabbar itself is fugly -- the next few days will spend
some time looking at making it prettier on Linux/Win and
more native on Mac (see MMTabBar).

src/DBAccess.cpp

@@ -95,12 +95,11 @@ void
 DBAccess::initDatabase(QDir home)
 {
 
-
-    if(db && db->database(sessionid).isOpen()) return;
-
     QString cyclist = QFileInfo(home.path()).baseName();
     sessionid = QString("%1").arg(context->athlete->cyclist);
 
+    if(db && db->database(sessionid).isOpen()) return;
+
     // use different name for v3 metricDB to avoid constant rebuilding
     // when switching between v2 stable and v3 development builds
     db = new QSqlDatabase(QSqlDatabase::addDatabase("QSQLITE", sessionid));