fix case where BOM is asked for, and fix case where file with BOM is

consulted, not just read. Also fix some deadlocks when protecting
file access.


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@2066 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

changes-5.1.html

@@ -17,6 +17,7 @@
 
 <h2>Yap-5.1.3:</h2>
 <ul>
+<li> FIXED: more BOM trouble (obs from P Moura).</li>
 <li> FIXED: testing for BOM forced incorrect execution of gets (obs
   from A N Saravanaraj), also fixed stup call to Ungetc in getc and
   friends.</li>