A lot less assert

There still some assert left in the code, but removed
a fair number of the examples where, its just as easy
to handle the condition gracefully, without crashing.

By 3.1 we will have eradicated assert from the code.

src/SyncRideFile.cpp

@@ -20,7 +20,6 @@
 #include <QSharedPointer>
 #include <QMap>
 #include <QSet>
-#include <assert.h>
 #include <stdio.h>
 #include <stdint.h>
 #include <math.h>