Add createSimilarSurface
Add createSimilarSurface

createSimilarSurface is the GC managed partner to withSimilarSurface
just like createImageSurface is the GC managed version of withImageSurface

darcs-hash:20060202005148-b4c10-98647cbd34b257667b8bc6d6a0f0c4b7a5df98cb.gz

thiagoarrais/gtk2hs,thiagoarrais/gtk2hs,thiagoarrais/gtk2hs