Merge branch 't/sched_improvements'

This topic has been cooking for a month. During this period, one
problem on BSD has been found and fixed.

	3ad5b0 Fix build on FreeBSD
	484e75 sched: Rename new_post_select back to post_select.
	74c880 sched: Kill old ->post_select variant.
	c77e19 grab client: Switch to the alternative post select method.
	38aeac client supervisor: Switch to the alternative post select method.
	e009fa client exec: Switch to the alternative post select method.
	742718 i9e: Switch to the alternative post select method.
	2e6b8f vss: Switch to the alternative post select method.
	6e83b4 stdout: Switch to the alternative post select method.
	1995ce stdin: Switch to the alternative post select method.
	88b0ec audioc: Switch to the alternative post select method.
	b210e8 afs command task: Switch to the alternative post select method.
	12f683 afs signal task: Switch to the alternative post select method.
	ccef24 server signal task: Switch to the alternative post select method.
	a6dabd server command task: Switch to the alternative post select method.
	855c53 write: Switch to the alternative post select method.
	58b74b play: Switch to the alternative post select method.
	cf4982 afh_recv:  Switch to the alternative post select method.
	4dc05b client: Switch to the alternative post select method.
	043fd6 audiod: Switch command_task to the alternative post select method.
	ce462a audiod: Switch the status task to the alternative post select method.
	a7f2d1 audiod: Switch signal task to the alternative post select method.
	ba2f65 osx writer: Switch to the alternative post select method.
	3642d2 oss writer: Switch to the alternative post select method.
	c29db3 file writer: Switch to the alternative post select method.
	36875c ao: Switch to the alternative post select method.
	3b3049 alsa: Switch to the alternative post select method.
	60b853 wmadec: Switch to the alternative post select method.
	6c8719 wav filter: Switch to the alternative post select method.
	03e915 spxdec: Switch to the alternative post select method.
	24bbc5 resample: Switch to the alternative post select method.
	4ca80f prebuffer: Switch to the alternative post select method.
	a55083 oggdec: Switch to the alternative post select method.
	806d26 mp3dec: Switch to the alternative post select method.
	7dcaf5 flacdec: Switch to the alternative post select method.
	4dc9b9 fecdec: Switch to the alternative post select method.
	f6e2cb compress: Switch to the alternative post select method.
	ac3371 amp: Switch to the alternative post select method.
	7c2c68 aacdec: Switch to the alternative post select method.
	b333e0 dccp_recv: Switch to the alternative post select method.
	00e793 udp_recv: Switch to the alternative post select method.
	9c00a7 sched: Provide alternative post_select variant.
	24758c Replace gettimeofday() by clock_gettime().
	01f802 sched: Get rid of (pre)select shortcuts.
	5bb44a audiod: Avoid delay when closing slot.

Conflicts:
	string.c

diff --cc Makefile.in
Simple merge

diff --cc NEWS
index 591d935d63741cc663c7064fd7903c0d1856fd9d,f323df1dda766dadfdc7fe559e6a39fa42824d58..56f84753314b71f7f41b193eb4e7a6df6ce8d82f
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -2,8 -2,6 +2,11 @@@
  0.?.? (to be announced) "spectral gravity"
  ------------------------------------------
  
 +      - UTF8 support for para_gui and the mp3 audio format handler.
++      - Scheduler improvements and fixes.
++      - The obsolete gettimeofday() function has been replaced
++        by clock_gettime() on systems which support it.
 +
  -----------------------------------------
  0.4.12 (2012-12-20) "volatile relativity"
  -----------------------------------------

diff --cc aacdec_filter.c
Simple merge

diff --cc configure.ac
Simple merge

diff --cc string.c
index a416dc80cce868563ef82ae6647c9a07651ec4ea,e5de147c65975c21018b3e0b6d30eb932e52edf1..dfcfa2cdf6eb776c63afdaec981aed55147a31b1
--- 1/string.c
--- 2/string.c
+++ b/string.c
@@@ -6,12 -6,8 +6,11 @@@
  
  /** \file string.c Memory allocation and string handling functions. */
  
- #include <sys/time.h> /* gettimeofday */
 +#define _GNU_SOURCE
 +
  #include <pwd.h>
  #include <sys/utsname.h> /* uname() */
 +
  #include <string.h>
  #include <regex.h>