[Mutt] #2969: new function: lock-tag-prefix
#2969: new function: lock-tag-prefix
 I wanted a way to have a macro that:
  - when applied with tag-prefix, applies several commands to all tagged
 messages
  - when applied without tag-prefix, applies the same commands to the
 current message
 So I added two functions to mutt: lock-tag-prefix and unlock-tag-prefix.
 The idea is that the said macro starts with <lock-tag-prefix> and ends
 with <unlock-tag-prefix>.
 lock-tag-prefix lock the tag-prefix to "on", but only if it is in effect.
 unlock-tag-prefix unlocks it.
 Please let me know if you apply this patch and require me to write the
 documentation, I'll try to write something sensible.
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Ticket URL: <http://dev.mutt.org/trac/ticket/2969>