Fix Help URLs

.. and add link to the forum
Accidentally left a debug() in CsvRideFile

.. so deleting it !
fix "Time Riding" for rides without kph

"Time Riding" was only calculated when the ride had kph values - although
it's then also including time without kph but cadence. This caused it to
skip all time spent on the trainer (... if there's no sensor on the rear
wheel).

This patch makes it consistently calculate "Time Riding" if there's kph or
cad... might be worth to count time with pwr or similar running metrics,
too.
LTM curves: edit metric on double click

more comfortable alternative to select + click edit button: allow double
clicking on a row in the metric list to edit it's settings.
AthleteDirectory - Folder Structure Part 2 of 2 + Always create .JSON

... create folder structure for existing and new athletes
... upgrade existing athlete to new structure when opening / incl.
logging and error handling
... convert any "Downloaded" file to .JSON directly - store source file
in /downloads
... convert any "Imported" file to .JSON directly - store source file in
/imports