This replaces #77 based on the new config feature. It is based on top of #78.

This

• adds some REPL tools to the user namespace
• has a working single-server RAFT config with simple user ns startup
• Adjusts some of our default settings to be more reasonable (open to debate)
• Fixes http-api call dev namespace
• excludes dev/data director in .gitignore, and dev namespaces now by default write data to that directory