Bug #438 - Reports sorting by end_time, start_time, and entry_time are ordered incorrectly

- Fixed bug #438, correcting the sorting of the entry_time, start_time
  and end_time columns (thanks to Michelle Crane).
- Reordered ChangeLog so that bugs, features are in sequence.  Don't know
  why I did this.  Some inner compulsion.
- Deprecated silly start_time, end_time and entry_time columns, which are
  now (and were) superseded by start, end and entry columns with time formats.
- Config.cpp now detects use of these deprecated fields and complains to the
  show command.
- Date.cpp now uses the variable 'input' instead of 'mdy', which was confusing
  and implied that it contained a date without a time.
- Obsoleted and removed Date::toStringWithTime, which ignored requested formats.
- When checking for an epoch, Date::isEpoch just looked for strings of more
  than 8 digits.  The additional restriction of less than or equal to 10 digits
  was added.  This was breaking unit tests using the dateformat YMDHNS, which is
  reasonable.
- Removed the obsolete field format hooks format-entry_time, format-start_time
  and format-end_time
- Removed the obsolete field format hook unit tests hook.format-entry_time.t,
  hook.format-start_time.t and hook.format-end_time.t.
- Removed use of deprecated field in hook.format-countdown_compact.t.
- Added missing shortcut comparisons in Table::sort that was causing an
  unnecessary full parse of dates even if they were identical as strings.
- Coded entry_time as a synonym for entry.  Ditto for start_time and end_time.
- Marked the new synonyms as deprecated.
- Added bug.438.t unit test.
- Added deprecated fields to the NEWS file.

ChangeLog

@@ -5,11 +5,11 @@
  + Added feature #189, that records the start and stop times
    as an annotation for a task.
  + Added feature #423, now custom report filters allow rc overrides.
+ + Added feature #428, preparing the new structure for the NEWS file.
  + Added feature #429, which improves the 'all' report to exclude deleted.
    tasks, provide a new sort order and include the 'end' column.
  + Added feature #431, which improves feedback after running the 'log'
    command.
- + Added feature #428, preparing the new structure for the NEWS file.
  + New 'depends' column for custom reports.
  + New 'blocked' report for showing blocked tasks.
  + Improved man pages (thanks to Andy Lester).
@@ -18,7 +18,9 @@
  + Fixed bug #427, preventing the task edit command to parse annotation
    dates with spaces.
  + Fixed bug #433, making task command output more consistent.
- + Fixed bug #434, allowing users to complete tasks with status 'waiting'.
+ + Fixed bug #434, allowing users to complete tasks with status 'waiting'
+ + Fixed bug #438, correcting the sorting of the entry_time, start_time
+   and end_time columns (thanks to Michelle Crane).
  + Fixed bug #439, which ignored dateformat.annotation for sparse annotations.
 
 ------ old releases ------------------------------