Remove sken soft link
Update version to 0.33
Merge pull request #97 from sot/remove-sken

Remove sken alias for Ska.engarchive
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