[Remind-Fans] Loving new subst_N() functions!

[Tim Chase]

Just a little note to convey my appreciation for the subst_n() functions.

Prior to converting over to using them, I had

  $ git diff --shortstat HEAD~
  22 files changed, 122 insertions(+), 120 deletions(-)

~120 instances of

  [timespan()]

across ~22 files that are all now just "%z" (I always want 4-digit
years, so %z was a perfect candidate)

Such a nice little improvement.

Thanks!

-tim