Re-write documentation and all examples of dynamically linked functions. * doc/interpreter/dynamic.txi: deleted. * doc/interpreter/external.txi: Renamed from dynamic.txi. Rewrote or added much information about dynamically linked functions. * doc/interpreter/Makefile.am: Changed dynamic.txi to external.txi in build system. * doc/interpreter/data.txi, doc/interpreter/intro.txi, doc/interpreter/octave.texi, doc/interpreter/sparse.txi: Changed dynamic.txi to external.txi in cross-references. * doc/interpreter/doccheck/aspell-octave.en.pws: Added new words from external.txi to Octave dictionary. * examples/firstmexdemo.c: deleted. * examples/mex_demo.c: Renamed from firstmexdemo.c. Added many more comments to code. * examples/hello.cc: deleted. * examples/oct_demo.cc: Renamed from hello.cc. Added many more comments to code. * examples/Makefile.am: Changed build system to use mex_demo.c and oct_demo.cc. * examples/addtwomatrices.cc, examples/celldemo.cc, examples/embedded.cc, examples/fortdemo.cc, examples/funcdemo.cc, examples/globaldemo.cc, examples/helloworld.cc, examples/mycell.c, examples/myfeval.c, examples/myfunc.c, examples/myhello.c, examples/mypow2.c, examples/myprop.c, examples/myset.c, examples/mysparse.c, examples/mystring.c, examples/mystruct.c, examples/paramdemo.cc, examples/standalone.cc, examples/stringdemo.cc, examples/structdemo.cc, examples/unwinddemo.cc: Use Octave coding conventions for code. Fixed all compilation errors and warnings.

--- a/examples/helloworld.cc
+++ b/examples/helloworld.cc
@@ -4,8 +4,10 @@
   "Hello World Help String")
 {
   int nargin = args.length ();
-  octave_stdout << "Hello World has " << nargin
-        << " input arguments and "
-        << nargout << " output arguments.\n";
+
+  octave_stdout << "Hello World has "
+                << nargin << " input arguments and "
+                << nargout << " output arguments.\n";
+
   return octave_value_list ();
 }