Custom Reports

- Integrated new View in place of Table for all custom reports.
- Implemented legacy field mapping for columns and sort fields.
- Implemented rc.indent.report.
- Implemented rc.row.padding.
- Implemented rc.column.padding.
- Implemented rc.color.label.
- Modified default rc.indent.annotation from 1 to 2.
- Implemented urgency value caching.
- Implemented View truncation by line and row.
- Columns now know which report thy belong to, so they can use the
  rc.report.<report>.dateformat override.
- Assorted bugs remain.

src/Task.h

@@ -52,6 +52,8 @@ public:
 
   // Public data.
   int id;
+  float urgency_value;
+  bool recalc_urgency;
 
   // Series of helper functions.
   static status textToStatus (const std::string&);
@@ -82,7 +84,7 @@ public:
 
   void validate () const;
 
-  double urgency ();
+  float urgency ();
 
 private:
   int determineVersion (const std::string&);