Optimizations of JT9 and JT65 decoders; change clock in timer routine.

Both decoders now have slightly better performance and faster
execution.  The rare "duplicate decodes" in JT9 were eliminated.
On Windows, at least, calls to f90 routine system_clock() do not
provide correct wall time increments.  Changed to using secnds()
instead.


git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@4571 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

lib/timer.f90

@@ -38,7 +38,9 @@ subroutine timer(dname,k)
      on(n)=.true.
 !     call system_clock(icount,irate)
 !     ut0(n)=float(icount)/irate
-     call cpu_time(ut0(n))
+!     call cpu_time(ut0(n))
+     ut0(n)=secnds(0.0)
+
      ncall(n)=ncall(n)+1
      if(ncall(n).gt.1.and.nlevel(n).ne.level) then
         nlevel(n)=-1
@@ -53,7 +55,9 @@ subroutine timer(dname,k)
         on(n)=.false.
 !        call system_clock(icount,irate)
 !        ut1=float(icount)/irate
-        call cpu_time(ut1)
+!        call cpu_time(ut1)
+        ut1=secnds(0.0)
+
         ut(n)=ut(n)+ut1-ut0(n)
      endif
      level=level-1