bug#1863: Improved grep prompt

[jidanni]

JL> It already says that.
JL> `C-h f grep RET':
But nobody would look there often. All I know is I took the Tutorial
in the 80's and would never know about the two new greps unless
alerted somehow.
JL> There is already a template option for the old `grep'.
JL>     grep-command is a variable defined in `grep.el'.
JL>     Its value is "grep -nH -e *"
Ah, newer than Debian sid. OK, doing
(setq grep-command "grep -nHe *"); until emacs 23
By the way, you can combine the nH and e options to save some minibuffer.