Add Extended WKB writer

[Davichet-e]

Problem

I'm creating the bindings for a C library that requires as an input Extended WKB format. I see that GEOS does support writing to Extended WKB, so I was wondering whether it is something planned to be added in the future or whether there's a way to already accomplish this.

Thank you very much in advance.

[lnicola]

Sorry, never mind.