Added entry for fpectl module documentation.

Moved the mutex docs to be adjacent to the sched docs, since these are
meant to be used together (if they are used at all!).

Doc/lib/lib.tex

@@ -74,6 +74,7 @@ and how to embed it in other applications.
 \input{libpython}		% Python Runtime Services
 \input{libsys}
 \input{libgc}
+\input{libfpectl}
 \input{libatexit}
 \input{libtypes}
 \input{libuserdict}
@@ -137,6 +138,7 @@ and how to embed it in other applications.
 %\input{libcmpcache}
 \input{libtime}
 \input{libsched}
+\input{libmutex}
 \input{libgetpass}
 \input{libcurses}
 \input{libascii}		% curses.ascii
@@ -155,7 +157,6 @@ and how to embed it in other applications.
 \input{libselect}
 \input{libthread}
 \input{libthreading}
-\input{libmutex}
 \input{libqueue}
 \input{libmmap}
 \input{libanydbm}