Revise asyncore documentation and document asynchat for the first time.

Doc/Makefile.deps

@@ -315,6 +315,7 @@ LIBFILES= $(MANSTYLES) $(INDEXSTYLES) $(COMMONTEX) \
 	lib/libstatvfs.tex \
 	lib/libtty.tex \
 	lib/libasyncore.tex \
+	lib/libasynchat.tex \
 	lib/libatexit.tex \
 	lib/libmmap.tex \
 	lib/tkinter.tex \

Doc/lib/lib.tex

@@ -217,6 +217,7 @@ and how to embed it in other applications.
 \input{libxmlrpclib}
 \input{libsimplexmlrpc}
 \input{libasyncore}
+\input{libasynchat}
 
 \input{netdata}                 % Internet Data Handling
 \input{libformatter}