Document changes to Sieve

* NEWS: Update.
* doc/texinfo/libmu_sieve.texi: Update.
* doc/texinfo/sieve.texi: Document extensions

* libmu_sieve/comparator.c (mu_sieve_match_part_checker): Check
the type of the 2nd argument.
* sieve/sieve.c: Define "location" and "phase" environment items.
* sieve/tests/pipetest.at: Use "pipe" as the capability string.

-GNU mailutils NEWS -- history of user-visible changes. 2016-12-07
+GNU mailutils NEWS -- history of user-visible changes. 2016-12-13
 Copyright (C) 2002-2016 Free Software Foundation, Inc.
 See the end of file for copying conditions.
 
@@ -7,8 +7,34 @@ Please send mailutils bug reports to <bug-mailutils@gnu.org>.
 
 Version 3.0.90 (Git)
 
-Sieve library essentially rewritten.  It now inludes support for
-the "variables" extension (RFC 5229).
+* Sieve
+
+The Sieve library essentially rewritten.  The following new extensions
+are implemented:
+
+ encoded-character  -  RFC 5228, 2.4.2.4
+ variables          -  RFC 5229
+ environment        -  RFC 5183
+
+The tools define the Sieve environment "location", and
+"phase" as follows:
+
+  Utility |  "location" | "phase"
+  --------+-------------+--------
+  maidag  |  "MDA"      | "during"
+  inc     |  "MUA"      | "post"
+  sieve   |  "MS"       | "post"
+
+The "sieve" utility provides new option: --environment, for
+manipulating the environment.
+  
+* Bugfixes
+** Fix program name duplicate in the output of "mailutils help COMMAND"
+** Fix several bugs in mhn
+** Fix expansion of #, &, %, etc. in mail "copy" and "file" commands.
+** Fix improper permissions after delivery to MH and Maildir mailboxes.
+** Fix stream flushing code
+** Fix the implementation of -nowhatnowproc option in mh
 
 
 Version 3.0 - 2016-11-06

@@ -225,12 +225,18 @@ mu_sieve_match_part_checker (mu_sieve_machine_t mach)
 	  compfun = comp_false;
 	  val = mu_sieve_get_arg_untyped (mach, 1);
 	  /* NOTE: Type of val is always SVT_STRING_LIST */
-	  if (val->type != SVT_STRING_LIST)
-	    abort ();
-	  if (val->v.list.count > 1)
+	  switch (val->type)
 	    {
+	    case SVT_STRING:
+	      break;
+	      
+	    case SVT_STRING_LIST:
+	      if (val->v.list.count == 1)
+		break;
+	      /* fall through */
+	    default:
 	      mu_diag_at_locus (MU_LOG_ERROR, &mach->locus, 
-			_("second argument must be a list of one element"));
+				_(":count requires second argument to be a list of one element"));
 	      mu_i_sv_error (mach);
 	      return 1;
 	    }

@@ -484,6 +484,8 @@ main (int argc, char *argv[])
       mu_error (_("cannot initialize sieve machine: %s"), mu_strerror (rc));
       return EX_SOFTWARE;
     }
+
+  sieve_setenv ("phase=post", mach);
   mu_list_foreach (env_list, sieve_setenv, mach);
   mu_list_destroy (&env_list);
     

@@ -17,7 +17,7 @@
 m4_pushdef([MUT_SIEVE_EXT_NAME],[pipe test])
 
 MUT_SIEVE_EXT_TEST([],[pipetest00],
-[require "test-pipe";
+[require "pipe";
 if pipe :header "$cwd/ckmsg"
   {
     discard;