Remove Go -longsize option.
Go: Don't require that Go environment variables be set when running
examples or testsuite.
fixed %template within %extend, test added
fixed language symbol table nested classes name separator, test added
fixed %feature "flatnested" working with %extend
fixed Swig_offset_string for empty string
added simple template to save/restore values in current scope (readability reasons)
Make save_value non-copyable
Error test-suite updated for nested changes

WARN_DEPRECATED_NESTED_WORKAROUND test added
WARN_PARSE_NAMED_NESTED_CLASS test removed
In Examples/Makefile.in, compile and link the program in go and
go_cpp, rather than in go_run.  This permits eliminating go_run_cpp.
Use RUNME consistently in examples makefile
Suppress gcc-4.9 auto_ptr deprecation in test
C++11 tests re-organise - gcc-4.8 minimum expected for all to pass
C++11 support for new versions of erase and insert in the STL containers.

The erase and insert methods in the containers use const_iterator instead
of iterator in C++11.  There are times when the methods wrapped must match
the parameters exactly. Specifically when full type information for
template types is missing or SWIG fails to look up the type correctly,
for example:

  %include <std_vector.i>
  typedef float Real;
  %template(RealVector) std::vector<Real>;

SWIG does not find std::vector<Real>::iterator because %template using
typedefs does not always work and so SWIG doesn't know if the type is
copyable and so uses SwigValueWrapper<iterator> which does
not support conversion to another type (const_iterator). This resulted
in compilation errors when using the C++11 version of the containers.

Closes #73
Change the length of strings created from fixed-size buffers.

Use the usual C rule for NUL-terminated strings instead of discarding all the
trailing NUL characters.

This was unexpected (as buffers in C code are not necessarily always padded
with NULs to their full length) and also inconsistent among languages as this
was only done for those of them using typemaps/strings.swg but not for C# or
Java, for example, which terminated the string at the first NUL even before
this change.

Notice that this patch couldn't use strlen() or wcslen() with possibly not
NUL-terminated strings, so we had to add [our own equivalents of] strnlen()
and wcsnlen() and use them instead. This required adding yet another parameter
to string typemap macros, so update the example using them accordingly too.