Fix Metric/Imperial - conversion issues

In LTM Plot and on Summary Windows conversion
... data already converted for the curves was converted again
... for "Best" Summary the conversion was missing

Referring to issues #1067 #1071 (see also comments on issue #1069
Merge pull request #1146 from amtriathlon/master

Added pace to tooltip for speed histogram
Fix pace units in tool tip for non metric units
Merge pull request #1148 from jonbev/fix-pace-units-in-tooltip

Fix pace units in tool tip for non metric units
Split summary table into rides and runs

Might be nice to have a different metric set for rides and runs but a
bit beyond me at the moment.
Merge pull request #1149 from jonbev/separate-run-summary-table

Split summary table into rides and runs
Merge pull request #1137 from Joern-R/conversion

Fix Metric/Imperial - conversion issues
Add pace to tooltip in CV chart
Fixed units selection in histogram tooltip, it is independent of pace units
NB: CV chart currently doesn't obey units setting for speed, it is fixed to kph