Generic Filter expressions for NUnit tree

[CharliePoole]

So far we have discussed specific filters. But NUnit itself supports a general filter using the --where option of the console runner. The framework knows how to deal with the filters created by this option - (I wrote the parser)

Do we want this sort of functionality for the GUI? A command-line option does not seem very useful. Howe would we expose it the feature?

Decisions:

• Decide if we want this
• Decide how the user would activate it in the GUI
• Decide how it would display in the tree
• Decide what happens to the run commands if a filter is active.