tentative moving average; TODO complete
Commenting a little more thoroughly
One more explanatory comment
tm_yearly_line_plot() : working version

removed duplicate plot.topics.yearly() code from topics.R.
tm_yearly_line_plot() relies on tm_yearly_totals().

TODO add this plot to topic_report

TODO moving averages over multiple years
smoothing option, remove debug print()
yearly proportion plot added to topic_report

topic_report now wants tm_wide as well as tm_long.

also, bugfix in tm_yearly_totals: drop unused factor levels on date.
Fuller documentation for topic_report()

and moved the unused topic_keyword_multi to scrapheap
Merge branch 'moving_average'