Tweaks to allow headers to be glued together.

Added Python script to generate single header.
Added new XCode project that runs self test against single header

projects/SelfTest/ApproxTests.cpp

@@ -17,7 +17,7 @@ TEST_CASE
 (
     "./succeeding/Approx/simple", 
     "Some simple comparisons between doubles"
- )
+)
 {
     double d = 1.23;
     
@@ -29,3 +29,17 @@ TEST_CASE
     REQUIRE( Approx( d ) != 1.22 );
     REQUIRE( Approx( d ) != 1.24 );
 }
+
+///////////////////////////////////////////////////////////////////////////////
+TEST_CASE
+(
+    "./succeeding/Approx/epsilon", 
+    "Approximate comparisons with different epsilons"
+ )
+{
+    double d = 1.23;
+    
+    REQUIRE( d != Approx( 1.231 ) );
+    REQUIRE( d == Approx( 1.231 ).epsilon( 0.1 ) );
+//    REQUIRE( d != Approx( 1.232 ).epsilon( 0.1 ) );
+}