link contract shift

Introduction

This branch implements the "Link Contract Shift".

This refers to a change to the XDI graph model in which the structure of link contract addresses has changed.

Before the Link Contract Shift, link contracts used $to and $from words.
After the Link Contract Shift, link contracts use inner roots.

Examples

Before the Link Contract Shift:

[=]!:uuid:1111$to[=]!:uuid:1111$from$do$if$and/$true/({$from}/$is/[=]!:uuid:1111)
[=]!:uuid:1111$to[=]!:uuid:1111$from$do$if$and$or/$true/({$msg}<$secret><$token><$valid>&/&/true)
[=]!:uuid:1111$to[=]!:uuid:1111$from$do$if$and$or/$true/({$msg}<$sig><$valid>&/&/true)
[=]!:uuid:1111$to[=]!:uuid:1111$from$do/$all/

After the Link Contract Shift:

[=]!:uuid:1111/[=]!:uuid:1111/($do$if$and$or/$true/({$msg}<$secret><$token><$valid>&/&/true))
[=]!:uuid:1111/[=]!:uuid:1111/($do$if$and$or/$true/({$msg}<$sig><$valid>&/&/true))
[=]!:uuid:1111/[=]!:uuid:1111/($do/$all/)
[=]!:uuid:1111/[=]!:uuid:1111/($do$if$and/$true/({$from}/$is/[=]!:uuid:1111))