bug#56227: 29.0.50; Eshell globs ending with '/' should match directories only

[Jim Porter]

In regular shells, the pattern '*' matches any (non-dot) file, whereas 
'*/' only matches directories:

  $ echo *
  admin args config.log config.status doc etc leim lib lib-src lisp
  lwlib Makefile nextstep nt oldXMenu src test
  $ echo */
  admin/ doc/ etc/ leim/ lib/ lib-src/ lisp/ lwlib/ nextstep/ nt/
  oldXMenu/ src/ test/

However, in Eshell, both of these do the same thing:

  ~ $ echo *
  ("Makefile" "admin/" "args" "config.log" "config.status" "doc/" "etc/"
  "leim/" "lib-src/" "lib/" "lisp/" "lwlib/" "nextstep/" "nt/"
  "oldXMenu/" "src/" "test/")
  ~ $ echo */
  ("Makefile" "admin/" "args" "config.log" "config.status" "doc/" "etc/"
  "leim/" "lib-src/" "lib/" "lisp/" "lwlib/" "nextstep/" "nt/"
  "oldXMenu/" "src/" "test/")

For consistency with other shells, and to make Eshell's globbing more 
expressive, I think we should make the latter match directories only. 
While this technically changes an existing behavior, it should be a safe 
change to make, since there's currently no reason I'm aware of to add a 
trailing slash to an Eshell glob.

Patch forthcoming; just getting a bug number...