Some NUnit 2.5 Source Code Changes

Hi All, 

I just checked in a large set of changes that update how we
handle processing of constraint expressions.

I'm much happier than before with both how it works and
with the internal structure.

I'll be updating the docs and probably blogging about this,
but here are a few key points, expressed as valid constraint
expressions...

    // The change I posted about recently
   Has.Count.GreaterThan(0)
   Has.Message.StartingWith("Error");
   Has.Property("Age").InRange(21,99)

   // These two mean different things! (*)
   Has.Some.GreaterThan(0).And.Some.LessThan(42);
   Has.Some.GreaterThan(0).And.LessThan(42)

(*) Normally Some, All, and None wrap the entire expression 
    following them, including any binary operators. But the 
    binary operators are context-sensitive and know to increase
    their precedence level when directly followed by any of these.

   // Exception no longer takes an argument
   Throws.Exception
   Throws.Exception.TypeOf<ArgumentException>()   
   Throws.TypeOf<ArgumentException>()  // Same as preceding 
   Throws.Exception.InstanceOf<ArgumentException>()
   Throws.InstanceOf<ArgumentException>() // Same as preceding
   Throws.Exception.With.Message.Containing("my message")
   Throws.TypeOf(typeof(ArgumentException))
         .With.Property("ParamName").EqualTo("myparam")
         .And.Message.Containing("some string")

I listed a lot of Throws examples because
 1. It's new, and
 2. If you remember, implementing the .With. form of throws
    was a major motivator for all this restructuring.

In addition, the intellisense is now much better, no longer
inviting you to type two "Ands" in a row, for example. 

Getting this done will also make it possible for me to integrate 
some new items that were contributed by several of you - thanks
for your patience.

Charlie




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