Display average session count and flow ratio

Why:

* Optimize for flow work
* Look at actionable metric for current week

This change addresses the need by:

* Printing average pomodoro for current week
* Showing the ratio between flow and non flow activity

Show correct order in the graph view

Graph Stats with correct order

Why:

* Show correct graph

This change addresses the need by:

* Sort the query data before printing

Fix sort order in Weekly Data

Fix sorting in PrintWeekData

Why:

* Provide consistent results to user

This change addresses the need by:

* Sort data in util.go (for weekly data)

Fix terms

v0.0.10

Fix terms

Support Flow

v0.0.9

Update CHANGELOG.md

Remove work tracking from session tracking

v0.0.8

Update README.org

Add with-time flag

v0.0.7

Update changelog

Improve table formatting for show command

v0.0.6

Update changelog

ASCII Graphs for Joy and Importance

v0.0.5

Add changelog for next tag

Stats command fix

v0.0.4

Update changelog