More helpful run error messages

[JohnPTobe]

Currently the seed run error messages are a bit terse and confusing for those not familiar with the tool. For instance, if you don't realize how the input file keys are supposed to work and you just specify -i KEY1=value and there's an expected INPUT_FILE key, it just says that the INPUT_FILE key was expected and it's not clear what the problem is. Expanding the error message to state what keys were expected and which ones were specified would make things much clearer. Seeing the expected and given values right next to each other would make it clear what the problem is.

I.e. "Expected INPUT_FILE, recieved KEY1, KEY2"

Also, not having input files with a key name of INPUT_FILE would make things less confusing but that can't be helped at this point.