Allow examples and test-suite to be built out of source tree

- Examples/Makefile.in rules use SRCDIR as the relative source directory

- ./config.status replicates Examples/ source directory tree in build
  directory, and copies each Makefile to build directory, prefixed with
  a header which sets SRCDIR to source directory

- Examples/test-suite/.../Makefile.in set SRCDIR from Autoconf-set srcdir

- Examples/test-suite/errors/Makefile.in needs to filter out source
  directory from SWIG error messages

- Lua: embedded interpreters are passed location of run-time test

- Python: copy run-time scripts to build directory because of 2to3
  conversion; import_packages example copies __init__.py from source
  directory; test-suite sets SCRIPTDIR to location of run-time tests

- Javascript: binding.gyp renamed to binding.gyp.in so that $srcdir
  can be substituted with SRCDIR; removed './' from require() statements
  so that NODE_PATH can be used to point Node.js to build directory

Examples/test-suite/csharp/Makefile.in

@@ -3,14 +3,21 @@
 #######################################################################
 
 LANGUAGE     = csharp
+SCRIPTDIR    = $(srcdir)
 SCRIPTSUFFIX = _runme.cs
 CSHARPCILINTERPRETER  = @CSHARPCILINTERPRETER@
 CSHARPCILINTERPRETER_FLAGS = @CSHARPCILINTERPRETER_FLAGS@
 CSHARPPATHSEPARATOR = "@CSHARPPATHSEPARATOR@"
 CSHARPCYGPATH_W     = @CSHARPCYGPATH_W@
+
 srcdir       = @srcdir@
 top_srcdir   = ../@top_srcdir@
 top_builddir = ../@top_builddir@
+ifeq (.,$(srcdir))
+SRCDIR = ../
+else
+SRCDIR = ../$(srcdir)/
+endif
 
 CPP_TEST_CASES = \
 	csharp_attributes \
@@ -57,7 +64,7 @@ csharp_swig2_compatibility.cpptest: SWIGOPT += -DSWIG2_CSHARP
 
 # Makes a directory for the testcase if it does not exist
 setup = \
-	if [ -f $(srcdir)/$(SCRIPTPREFIX)$*$(SCRIPTSUFFIX) ]; then	  \
+	if [ -f $(SCRIPTDIR)/$(SCRIPTPREFIX)$*$(SCRIPTSUFFIX) ]; then	  \
 	  echo "$(ACTION)ing $(LANGUAGE) testcase $* (with run test)" ; \
 	else								  \
 	  echo "$(ACTION)ing $(LANGUAGE) testcase $*" ;		  \
@@ -71,10 +78,10 @@ setup = \
 # Note C# uses LD_LIBRARY_PATH under Unix, PATH under Cygwin/Windows and SHLIB_PATH on HPUX.
 # DYLD_FALLBACK_LIBRARY_PATH is cleared for MacOSX.
 run_testcase = \
-	if [ -f $(srcdir)/$(SCRIPTPREFIX)$*$(SCRIPTSUFFIX) ]; then \
+	if [ -f $(SCRIPTDIR)/$(SCRIPTPREFIX)$*$(SCRIPTSUFFIX) ]; then \
 	  $(MAKE) -f $*/$(top_builddir)/$(EXAMPLES)/Makefile \
 	  CSHARPFLAGS='-nologo -debug+ $(CSHARPFLAGSSPECIAL) -out:$*_runme.exe' \
-	  CSHARPSRCS='`$(CSHARPCYGPATH_W) $(srcdir)/$(SCRIPTPREFIX)$*$(SCRIPTSUFFIX)` `find $* -name "*.cs" -exec $(CSHARPCYGPATH_W) "{}" \+`' csharp_compile && \
+	  CSHARPSRCS='`$(CSHARPCYGPATH_W) $(SCRIPTDIR)/$(SCRIPTPREFIX)$*$(SCRIPTSUFFIX)` `find $* -name "*.cs" -exec $(CSHARPCYGPATH_W) "{}" \+`' csharp_compile && \
 	  env LD_LIBRARY_PATH="$*:$$LD_LIBRARY_PATH" PATH="$*:$$PATH" SHLIB_PATH="$*:$$SHLIB_PATH" DYLD_FALLBACK_LIBRARY_PATH= $(RUNTOOL) $(CSHARPCILINTERPRETER) $(CSHARPCILINTERPRETER_FLAGS) ./$*_runme.exe; \
 	else \
 	  cd $* && \