Add entry for curses.panel documentation.

Doc/Makefile.deps

@@ -241,6 +241,7 @@ LIBFILES= $(MANSTYLES) $(COMMONTEX) \
 	lib/libchunk.tex \
 	lib/libcodeop.tex \
 	lib/libcurses.tex \
+	lib/libcursespanel.tex \
 	lib/libascii.tex \
 	lib/libdl.tex \
 	lib/libmutex.tex \

Doc/lib/lib.tex

@@ -140,6 +140,7 @@ and how to embed it in other applications.
 \input{libgetpass}
 \input{libcurses}
 \input{libascii}                % curses.ascii
+\input{libcursespanel}
 \input{libgetopt}
 \input{libtempfile}
 \input{liberrno}