Removed old/broken tests from FSharpLex.Tests.
Created a placeholder module where we'll eventually implement tests for the DIET implementation.
Move Regex.fs and Graph.fs upwards in the file order. These files, along with Collections.fs, may eventually be split out into a regular-expression library similar to Graham.
Made the AugmentedPatterns module internal -- it shouldn't be publicly visible since it only contains internally-visible values.
Created a Table module with some helper functions for constructing the test parser tables.
Used the new Table module to clean up the code for the table-generation tests.