Monodocer <since/> support

Attached is a patch + unit tests which adds Docs/since elements to any
type/member which was not present in the previous version.

The basic logic is as follows:

  - If index.xml exists, read all of the /Overview/Assemblies/Assembly
elements, and store the found @Name and @Version attributes.

  - During Type/member processing, check to see if the assembly name
this type is from is within the list generated above.  If the assembly
is found, *and* the version of the current assembly is greater than the
assembly version stored above, create a <since/> element with a version
attribute containing the current assembly version, e.g.

	<since version="0.1.0.0" />

Very simple, very braindead, but should be fairly functional, and should
allow us to run `monodocer' on the class libs and get <since/> elements
generated for all of the types and members that were added in .NET 2.0.

...Except for one minor detail, which is that
monodoc/class/corlib/en/index.xml doesn't have
any /Overview/Assemblies/Assembly elements.  Hmm...

Any ideas?  We could add the /Overview/Assemblies/Assembly elements to
the index.xml files currently within monodoc/class/*/en/.

The one thing I *don't* want to do is use the Version information
embedded within the Type.xml files.  This will allow creation of
<since/> elements for members added to that type, but it won't permit
generation of <since/> elements for newly added Types (since they won't
have a previous file to compare versions with).

Alternatively, I could do the above, and always insert <since/> elements
for newly created types when the version is not 0.0.0.0...

Thanks,
 - Jon

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