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  now (and were) superseded by start, end and entry columns with time formats.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.

NEWS

@@ -17,6 +17,14 @@ New configuration options in task 1.9.3
   - journal.time, journal.time.start.annotation, journal.time.stop.annotation
   -
 
+Newly deprecated features in task 1.9.3
+
+  - entry_time, start_time and end_time are now synonyms for the entry, start
+    and end fields.  Recent enhancements to date formatting render these fields
+    obsolete.  The 'task show' command warns of the use of these deprecated
+    fields.  The synonyms will be removed in a future version of task.
+
+
 ---
 
 Task has been built and tested on the following configurations: