Deprecate userpath.txt

[ghost]

Replace the search for userpath.txt with a heuristic that looks for the config/data, config/system folders instead.

[donaldatball]

@ryanatball I was just thinking that it seems like config/data is less necessary than config/targets or config/tools. For example, in spec/install/config there is no /data folder. I'm thinking I might look for config/system and config/targets instead of what you put in the SCR description. Is that cool?

[ghost]

@donaldatball that's a better solution. COSMOS requires a config/system and config/targets but not a config/data so look for system and targets.

[donaldatball]

Closed with 7b0178d.