TAChart: Fix package compilation error due to missing tagraph.lrs

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45966 4005530d-fff6-0310-9dd1-cebe43e6787f
TAChart: Add property SuppressPrevUnit to TDateTimeIntervalChartSource. Respect FormatSettings.DecimalSeparator for milliseconds display.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45967 4005530d-fff6-0310-9dd1-cebe43e6787f