[redland-dev] C# cleanup

[Edd Dumbill]

This patch ensures underlying nodes and statements are copied when
needed.  It also includes a lot of cleanup, and implements IDisposable
for all Redland classes that wrap unmanaged resources.

I've not got any huge applications to test it on, so if Cesar you can
test it on your use cases, that'd be great.

 % diffstat ~/csharp.diff
 ChangeLog            |   98 +++++++++++++++++++++++++++++++++++++++
 Iterator.cs          |   58 +++++++++++++++--------
 Makefile.am          |    2
 Model.cs             |   59 +++++++++++++++++------
 Node.cs              |   51 ++++++++++++++------
 Parser.cs            |   46 +++++++++++++-----
 Query.cs             |   49 +++++++++++++------
 QueryResults.cs      |  128 ++++++++++++++++++++++++++++++++-------------------
 Serializer.cs        |   39 ++++++++++++---
 Statement.cs         |   78 ++++++++++++++++++++++++-------
 Storage.cs           |   35 +++++++++++--
 Stream.cs            |   51 +++++++++++++-------
 Uri.cs               |   40 +++++++++++++--
 examples/example2.cs |    2
 14 files changed, 561 insertions(+), 175 deletions(-)

-- Edd
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