Two small bug fixes

[rabc]

While testing the (great) idea, I came across two code mistakes:

1- FileSystemExchange init is not marked as public, making it impossible to use outside the LLVS package

2- The two inits inValue has a different first argument but has the same second argument, so when trying to use it with only the second value, the compiler gives the error Ambiguous use of 'init'. Since the two default values are doing the same (creating a UUID), I removed the default value from one of them.

[drewmccormack]

Thanks! I found the public FileSystemExchange one in another branch, but not merged yet.