FF4 - New Duration object

- Replaces convertDuration.

src/Makefile.am

@@ -1,2 +1,2 @@
 bin_PROGRAMS = task
-task_SOURCES = Config.cpp Date.cpp T.cpp TDB.cpp Table.cpp Grid.cpp Timer.cpp color.cpp parse.cpp task.cpp command.cpp edit.cpp report.cpp util.cpp text.cpp rules.cpp import.cpp Config.h Date.h T.h TDB.h Table.h Grid.h Timer.h color.h task.h
+task_SOURCES = Config.cpp Date.cpp T.cpp TDB.cpp Table.cpp Grid.cpp Timer.cpp Duration.cpp color.cpp parse.cpp task.cpp command.cpp edit.cpp report.cpp util.cpp text.cpp rules.cpp import.cpp Config.h Date.h T.h TDB.h Table.h Grid.h Timer.h Duration.h color.h task.h