[Piwik-trac] [Piwik] #291: Period compare mode

[Piwik]

#291: Period compare mode
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 Reporter:  mauser          |        Type:  New feature
   Status:  new             |    Priority:  major      
Milestone:  Stable release  |   Component:  Core       
  Version:                  |    Keywords:             
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 To add this feature we need a new calendar that supports "compare mode" -
 choosing 2 dates & periods to compare (#290) and DataTable_Compare (#289)

 We add 2 additional vars in url:
  * period_compare
  * period_date

 In period compare mode we display all graphs comparing data from 2
 periods.

 Note: When we switch to Pie chart or Bar graph we can display 2 graphs for
 different periods, but this should be added in visualization layer.

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Ticket URL: <http://dev.piwik.org/trac/ticket/291>
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