add more C++ convenience functions

flipver() etc.

ChangeLog

@@ -1,7 +1,7 @@
 11/2/15 started 8.0
 - remove old doc stuff, lots of doc improvements
-- add fliphor(), flipver(), rot90(), rot180(), rot270() convenience methods to
-  Python
+- add fliphor(), flipver(), rot90(), rot180(), rot270(), median(), dilate(), 
+  erode() convenience methods to Python and C++
 - python: use [] to index and slice image bands, use () to get a point
 - c++: use [] to band index, () returns a vector<double>
 - add shift option to cast

TODO

@@ -1,11 +1,3 @@
-- try:
-
-	vips embed k2.jpg x.jpg 10 10 1000 1000 --vips-cache-trace
-
-  we don't seem to show all ops or images, can we improve this?
-
-
-- does cplusplus need flipver() etc.?
 
 - are the mosaic functions calling vips_fastcor()? it must be very slow
 
@@ -22,9 +14,6 @@
 
   then im__chkpair() runs that 20 times, then loops ... oh dear
 
-- make a crappy gir_ffi patch to add unset for GValue, perhaps it will produce
-  a response
-
 - perhaps im_maxpos_subpel() / im_minpos_subpel() should be undeprecated,
   useful with vips_fastcor()
 

cplusplus/include/vips/VImage8.h

@@ -557,6 +557,64 @@ public:
 	std::complex<double> maxpos( VOption *options = 0 )
 		throw( VError );
 
+	VImage 
+	fliphor( VOption *options = 0 )
+		throw( VError )
+	{
+		return( flip( VIPS_DIRECTION_HORIZONTAL, options ) ); 
+	}
+
+	VImage 
+	flipver( VOption *options = 0 )
+		throw( VError )
+	{
+		return( flip( VIPS_DIRECTION_VERTICAL, options ) ); 
+	}
+
+	VImage 
+	rot90( VOption *options = 0 )
+		throw( VError )
+	{
+		return( rot( VIPS_ANGLE_D90, options ) ); 
+	}
+
+	VImage 
+	rot180( VOption *options = 0 )
+		throw( VError )
+	{
+		return( rot( VIPS_ANGLE_D180, options ) ); 
+	}
+
+	VImage 
+	rot270( VOption *options = 0 )
+		throw( VError )
+	{
+		return( rot( VIPS_ANGLE_D270, options ) ); 
+	}
+
+	VImage 
+	dilate( VImage mask, VOption *options = 0 )
+		throw( VError )
+	{
+		return( morph( mask, VIPS_OPERATION_MORPHOLOGY_DILATE, 
+			options ) ); 
+	}
+
+	VImage 
+	erode( VImage mask, VOption *options = 0 )
+		throw( VError )
+	{
+		return( morph( mask, VIPS_OPERATION_MORPHOLOGY_ERODE, 
+			options ) ); 
+	}
+
+	VImage 
+	median( int size = 3, VOption *options = 0 )
+		throw( VError )
+	{
+		return( rank( size, size, (size * size) / 2, options ) ); 
+	}
+
 	VImage 
 	floor( VOption *options = 0 )
 		throw( VError )