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Following changes have been made to DTC as of *850412133:
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1)#Fixed bugs for leap-year and January-February transitions
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2)#Month and year displays speeded up by formatting whole week at a time,
   rather than 1 terminal write for each day; likewise unflagged days within
   a month are not re-addressed.
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3)#Months are now uniformly displayed centered, in mixed upper/lower-case;
   days are displayed right justified.
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4)#Day-of-week is shown for daily appointment display; current half-hour
   is highlighted in reverse video.  Today's date is highlighted
   in reverse-video for week, month and year displays (also blinks for year),
   and current-day (i.e., the day corresponding to D command) is underlined
   for week and month displays.
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5)#Week display now uses VT100 graphics mode to draw true boxes, rather
   than approximations with | and =; month display for current month
   uses double-width characters.
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6)#+ and - commands now display the item they have moved to.
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7)#Purge command has been extended to support Unschedule (cancel) and
   eXchange (reschedule) commands.
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8)#Date/time string parsing has been thoroughly overhauled so that any
   reasonable character string will be interpreted reasonably, thus
   '1-feb' is this year, D 512 is same as 12-MAY-<this year>. '=' means
   same date, '*' means 8:00>5:00, and +/- may be used for date deltas.
   Examples:
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	X * +Y W
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   reschedules everything for the current day to same day next year, and
   displays resulting week's summary, while
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	X * +52W D
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   reschedules everything for the current day to same day of week next year,
   and shows resulting day's schedule, and
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	X 9>12 1>4
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   reschedules morning appointments to the afternoon (no redisplay).
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9)#Default appointments file is SYS$LOGIN:DTC.DAT (standard login directory,
   preferred over logical name ME:). Format of this file has not changed,
   except that trailing blanks and NULs will be deleted by P/U/X commands:
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 *	yymmddhhh Text (may include ESC sequences) (last h is 0 or 3)
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   Files are now opened with LIST carriage-control (rather than FORTRAN
   carriage-control), so that VMS TYPE or PRINT commands will display them
   correctly. The VMS command
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	SORT filename ;     (";" separated from filename by space)
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   will re-order the file if it has become unordered due to rescheduling
   or addition of appointments out of sequence.
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An unadvertised feature has been retained: if a time string is entered
for a command that defaults to D, without a corresponding appointment string,
the cursor will be placed at the appropriate point on the (empty) screen,
displaying a BLOT (X, ^Z) so that the user may type his appointment directly.
Examples
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	D 12:	or	EV	or	10>11:30
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(the last will be replicated 3 times).
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The program does >>> NOT <<< check that the user is on a VT100 or equivalent.