Prevent CLI parameters from being discarded

[pblasucci]

Fixes #633

This took a little while to hunt down. But, basically, the logic is:

1. Accumulate parameters from multiple sources
2. Rely on FSharp.Core's dict and readOnlyDict to de-duplicate values

The limitation of the above approach is that it is order dependent. This isn't bad, per se. But it means step one above needs to be handled carefully. So, this patch just changes the order in which things are accumulated (putting the userParameters at the end of the list).

[kMutagene]

Tested and it works as you say, great catch, thanks!