tests/test-parse-date

Tune a bit the extdiff toplevel comments/samples.

* Capitalize the first letter of all sentences

* Add an example for GNU diff(1) 'context diff' mode.

* Explain the requirement for separate cmd.xxx and opts.xxx
  options in .hgrc, which hopefully will guard against users
  trying to add:

      [extdiff]
      # Add a new Mercurial command called `cdiff', which calls
      # GNU diff(1) in 'context diff' mode.
      cmd.cdiff = diff -Nprc5

  which fails for recent crew builds with:

      $ hg cdiff .
      making snapshot of 1 files from rev 07dc4a569f4e
      making snapshot of 1 files from working dir
      diff -Nprc5: not found

  The correct way to do this is by separating the cmd.cdiff and
  opts.cdiff parts like this:

      [extdiff]
      # Add a new Mercurial command called `cdiff', which calls
      # GNU diff(1) in 'context diff' mode.
      cmd.cdiff = diff
      opts.cdiff = -Nprc5

  so add it as a new example and explicitly describe it in the
  extdiff comments.

#!/bin/sh

hg init
echo "test-parse-date" > a
hg add a
hg ci -d "2006-02-01 13:00:30" -m "rev 0"
echo "hi!" >> a
hg ci -d "2006-02-01 13:00:30 -0500" -m "rev 1"
hg tag -d "2006-04-15 13:30" "Hi"
hg backout --merge -d "2006-04-15 13:30 +0200" -m "rev 3" 1
hg ci -d "1150000000 14400" -m "rev 4 (merge)"
echo "fail" >> a
hg ci -d "should fail" -m "fail"
hg ci -d "100000000000000000 1400" -m "fail"
hg ci -d "100000 1400000" -m "fail"
hg log --template '{date|date}\n'