Documentation: V3 Release Notes

.. with key features, credits and a list of contributors.
Fix egregious ommission in the V3 credits

.. the project founder and all round ace guy was missing:
   SEAN RHEA!

.. sorry.
Add Starting LTS to Season

.. so we can seed 'CTL' for the PMC charts
Documentation: Full User Manual Structure

.. but no markup yet
Seed LTS from Season used in PMC

.. StressCalculator updated to use the stress seeded for
the period in question
Merge branch 'master' of github.com:/GoldenCheetah/GoldenCheetah
Documentation: Update FAQ for seeding CTL

.. since we have now added it to the season definition.