Requirement ID is now passed into the user vote table
Resolves nullpointerexception caused by null requirement
StatisticsPanel uses events rather than passing of panels
Cleanup of statisticsPanel
Cleanup of StatsDetailPanel
Correctly updates the info panel with the requirement to display
Replaces try-catch with if statement when selecting a requirement in the stats panel
Tests for StatisticsReqTable
Removes unused getters and setters in StatisticsPanel
Tests for StatisticsUserTable
Merge pull request #276 from TheTeam8s/refactor-StatisticsDetail

Refactor statistics detail panel