Updated the NetCDF Library Architecture image in the documentation.

.gitignore

@@ -1,4 +1,6 @@
 ### 'Normal' gitignore files.
+ctest.c
+ctest64.c
 debug.txt
 CTestConfig.cmake
 Vagrantfile

docs/architecture.dox

@@ -7,5 +7,14 @@ Documentation of netCDF architecture.
 \image latex netcdf_architecture.png "NetCDF Architecture"
 \image rtf netcdf_architecture.png "NetCDF Architecture"
 
+
+The netCDF C-based libraries depend on a core C library and some externally developed libraries.
+
+- NetCDF-Java is an independent implementation, not shown here
+- C-based 3rd-party netCDF APIs for other languages include Python, Ruby, Perl, Fortran-2003, MATLAB, IDL, and R
+- Libraries that don't support netCDF-4 include Perl and old C++
+- 3rd party libraries are optional (HDF5, HDF4, zlib, szlib, pnetcdf, libcurl), depending on what features are needed and how netCDF is configured
+- "Apps" in the above means applications, not mobile apps!
+
 */