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.

ChangeLog

@@ -12,6 +12,7 @@
  + Corrected sorting to use std::stable_sort instead of std::sort, which is not
    guaranteed stable (thanks to Stefan Hacker).
  + Enhanced diagnostics command.
+ + Performance enhancements.
  + The old 'curses' configuration variable is now replaced by 'detection', and
    has the same meaning - whether or not to auto-detect terminal size.
  + Added Czech Republic holiday files (thanks to Tomas Cech).
@@ -26,6 +27,7 @@
  + New 'dependency.indicator' configuration variable for the depends.indicator
    report field.
  + New 'indent.annotation' for the 'description.default' field format.
+ + New 'color.label' for colorizing the report column labels.
 
 # Tracked Features, sorted by ID.
  + Added feature #330, which supports the 'inverse' color attribute.