paste: new applet

function                                             old     new   delta
paste_main                                             -     493    +493
packed_usage                                       31019   31070     +51
applet_names                                        2569    2575      +6
applet_main                                         1484    1488      +4
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 3/0 up/down: 554/0)             Total: 554 bytes

Signed-off-by: Maxime Coste <mawww@kakoune.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/AUTHORS b/AUTHORS
index fa58697..5c9a634 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -178,3 +178,6 @@
 
 Jie Zhang <jie.zhang@analog.com>
     fixed two bugs in msh and hush (exitcode of killed processes)
+
+Maxime Coste <mawww@kakoune.org>
+    paste implementation