better checks of import/export settings

rowers/templates/rower_exportsettings.html

@@ -5,6 +5,34 @@
 {% block main %}
 <h1>Import and Export Settings for {{ rower.user.first_name }} {{ rower.user.last_name }}</h1>
 
+<p>You are currently connected to:
+  {% if r.c2token %}
+  Concept2 Logbook,
+  {% endif %}
+  {% if r.sporttrackstoken %}
+  SportTracks,
+  {% endif %}
+  {% if r.underarmourtoken %}
+  Under Armour (MapMyFitness),
+  {% endif %}
+  {% if r.tptoken %}
+  TrainingPeaks,
+  {% endif %}
+  {% if r.polartoken %}
+  Polar,
+  {% endif %}
+  {% if r.garmintoken %}
+  Garmin Connect,
+  {% endif %}
+  {% if r.stravatoken %}
+  Strava,
+  {% endif %}
+  {% if r.runkeepertoken %}
+  Runkeeper.
+  {% endif %}
+  Strava,
+</p>
+
 {% if form.errors %}
 <p style="color: red;">
   Please correct the error{{ form.errors|pluralize }} below.