dired-do-delete: Allow to delete dirs recursively without prompts

* lisp/dired.el (dired-delete-file): Accept 2 additional answers:
'all', to delete all directories recursively and no prompt anymore.
'quit', to cancel directory deletions (Bug#27940).
Show help message when user inputs 'help'.
(dired-do-flagged-delete): Bind locally dired-recursive-deletes
so that we can overwrite its global value.
Wrapp the loop within a catch '--delete-cancel to catch when
the user abort the directtry deletion.
* doc/emacs/dired.texi (Dired Deletion): Update manual.
* etc/NEWS (Changes in Specialized Modes and Packages in Emacs 26.1):
Announce this change.

1 files changed, 4 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index b72793dec08..b47bf959bed 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -611,6 +611,10 @@ paragraphs, for the purposes of bidirectional display.
 ** Dired
 
 +++
+*** You can answer 'all' in 'dired-do-delete' to delete recursively all
+remaining directories without more prompts.
+
++++
 *** Dired supports wildcards in the directory part of the file names.
 
 +++