Added in unimplemented API extension to the synthesizing factory, allowing
synthesis from a list of strongly-typed test cases all sharing the same type.
This obviously fails its test right now.

--HG--
extra : amend_source : 57b69dda2ab91c8f3a1e89b98f6f81e4e8bb424b
Added new test to document behaviour for zero-strength case.
'TestConsistencyOfWeaklyAndStronglyTypedApis' now passes.
Making sure that synthesized test case enumerable factories using curried
F# functions are also being tested - actually doing that by testing the
C# convenience wrappers for fixed-arity tupled functions, but this will do for
now.
Add test 'TestCoverageOfImplicitPermutationsIsComplete' to set some expectations
for the implicit permutation in synthesis API - the latter not being implemented
yet.
Correct test expectations to take sub-permutations into account.
Another correction to the test expectations - must take into account the actual
number of test variables in the fine slice.
Always choose test variables from different subtrees to ensure the resulting
test cases actually exhibit permutation when sliced.
Make the generation of permutations a bit less eager.
Only one subtree in an interleave has to be forced to contain a permuting
synthesizing node.
Implement functionality tested by
'TestCoverageOfImplicitPermutationsIsComplete'.
Optimise test performance for 'TestCoverageOfImplicitPermutationsIsComplete' and
fix bug where the permutation example was being produced for a non-prunable
subtree of a pruned tree root.
Correct obsolete comment.
Push NuGet package 1.3.0.0 to NuGet.

--HG--
rename : development/solution/NTestCaseBuilder/NTestCaseBuilder.1.2.2.0.nupkg => development/solution/NTestCaseBuilder/NTestCaseBuilder.1.3.0.0.nupkg
Added tag 1.3.0.0 for changeset a8c5019c0570
Add support for synthesizing deferred permutations.
Updated documentation - corrected typos, made some points more explicit and
added a note on progress.