added qhash functions for timerange and rational

So these keys can be used in QHash containers, they need functions for how to
create those hashes.

app/common/rational.cpp

@@ -421,3 +421,8 @@ QDebug operator<<(QDebug debug, const rational &r)
   debug.nospace() << r.numerator() << "/" << r.denominator();
   return debug.space();
 }
+
+uint qHash(const rational &r, uint seed)
+{
+  return qHash(r.toDouble(), seed);
+}

app/common/rational.h

@@ -126,4 +126,6 @@ QDebug operator<<(QDebug debug, const rational& r);
 
 Q_DECLARE_METATYPE(rational)
 
+uint qHash(const rational& r, uint seed);
+
 #endif // RATIONAL_H

app/common/timerange.cpp

@@ -41,14 +41,9 @@ void TimeRange::set_range(const rational &in, const rational &out)
   normalize();
 }
 
-bool TimeRange::operator<(const TimeRange &r) const
+bool TimeRange::operator==(const TimeRange &r) const
 {
-  return (in() + out()) < (r.in() + r.out());
-}
-
-bool TimeRange::operator>(const TimeRange &r) const
-{
-  return (in() + out()) > (r.in() + r.out());
+  return in() == r.in() && out() == r.out();
 }
 
 void TimeRange::normalize()
@@ -63,3 +58,8 @@ void TimeRange::normalize()
   // Calculate length
   length_ = out_ - in_;
 }
+
+uint qHash(const TimeRange &r, uint seed)
+{
+  return qHash(r.in(), seed) ^ qHash(r.out(), seed);
+}

app/common/timerange.h

@@ -16,8 +16,7 @@ public:
   void set_out(const rational& out);
   void set_range(const rational& in, const rational& out);
 
-  bool operator<(const TimeRange &r) const;
-  bool operator>(const TimeRange &r) const;
+  bool operator==(const TimeRange& r) const;
 
 private:
   void normalize();
@@ -27,4 +26,6 @@ private:
   rational length_;
 };
 
+uint qHash(const TimeRange& r, uint seed);
+
 #endif // TIMERANGE_H