Add EPS derived parameters
Change add_derived to start from 1999:200 and fix content logic
Start derived params from 1999:2000 and fix mistake in notes
PEP8 and fix line endings for unix
Remove leftover debug statement
Tweak notes
Add API docs for EPS derived params
Update version to 0.34.0
Merge pull request #96 from sot/eps-derived

Add EPS derived parameters and tidy the update procedure / tools