include thread_sleep functionality.

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1653 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

changes-5.1.html

@@ -16,6 +16,8 @@
 
 <h2>Yap-5.1.2:</h2>
 <ul>
+<li> FIXED: check_callable should check for modules (obs Paulo Moura).</li>
+<li> NEW: add thread_sleep/1, mostly works like system:sleep/1 (request from Paulo Moura).</li>
 <li> NEW: add select/3 and intersection/3 to SWI emulation.</li>
 <li> FIXED: always keep in mind that Yap_WakeUp may change H (would
 break chr).</li>