A bunch of semi-related tasks to help transition to mediKanren 2

[webyrd]

Since we are moving to mediKanren 2, there are a bunch of related things to do:

• port the webserver to mediKanren 2

• implement TRAPI 1.1 compliance for the May Relay

• augment our server with “pragma” style directives that extend TRAPI, so we can do reasoning that TRAPI doesn’t currently support, but which is useful to PMI use cases

• implement the ability for TRAPI requests to span multiple KGs

• implement light weight reasoning / query expansion

• implement / improve node and edge normalization

• make sure the NCATS TRAPI queries we are getting don’t break or DoS the server, and return reasonable answers

[jeffhhk]

Broken out separately into #62 through #71.

@webyrd Please close. I do not have permission to do so.