Allow users add/remove stats to the My Activities page and export to CSV.

[PhilC]

I would like to be able to choose which stats get displayed in My Activities. For example I might like to add the Max Speed column. Then I can sort the rides by max speed. Or I might like to add the bike used or the running shoes used etc. It would be nice to be able to add/remove stats from a drop down list of available stats. I appreciate that not all stats are applicable to all activities but you could just show the value as blank if the chosen stat does not apply to the current activity row such as when the user has not filtered the activities for a single activity type.

The stats chosen and their column order should be stored in the user profile so that they are remembered between sessions. I would also add a "reset to default" option somewhere too.

Once the above is done add an export to CSV option so that the configured columns can be exported for offline analysis.