Remove single character equivalent of --nodates (was -D)

mercurial/commands.py

@@ -2852,7 +2852,7 b' table = {'
           ('p', 'show-function', None,
            _('show which function each change is in')),
           ('g', 'git', None, _('use git extended diff format')),
-          ('D', 'nodates', None, _("don't include dates in diff headers")),
+          ('', 'nodates', None, _("don't include dates in diff headers")),
           ('w', 'ignore-all-space', None,
            _('ignore white space when comparing lines')),
           ('b', 'ignore-space-change', None,
@@ -2866,7 +2866,7 b' table = {'
          [('o', 'output', '', _('print output to file with formatted name')),
           ('a', 'text', None, _('treat all files as text')),
           ('g', 'git', None, _('use git extended diff format')),
-          ('D', 'nodates', None, _("don't include dates in diff headers")),
+          ('', 'nodates', None, _("don't include dates in diff headers")),
           ('', 'switch-parent', None, _('diff against the second parent'))],
          _('hg export [-a] [-o OUTFILESPEC] REV...')),
     "debugforget|forget":

tests/test-help.out

@@ -179,7 +179,7 b' options:'
  -a --text                 treat all files as text
  -p --show-function        show which function each change is in
  -g --git                  use git extended diff format
- -D --nodates              don't include dates in diff headers
+    --nodates              don't include dates in diff headers
  -w --ignore-all-space     ignore white space when comparing lines
  -b --ignore-space-change  ignore changes in the amount of white space
  -B --ignore-blank-lines   ignore changes whose lines are all blank