star shift

Introduction

This branch implements the "Star Shift".

This changes the semantics of the ! character from being a "context symbol" to being the "immutability symbol" that may appear after any context symbol. This also changes the format of "cloud numbers". Related to the Star Shift, other changes are that peer roots may only contain a single contextual arc, e.g. (=!:uuid:1111) instead of ([=]!:uuid:1111), and the introduction of the _ character as the "relativity prefix".

Examples

Graph before the Star Shift:

(=markus)/$ref/([=]!:uuid:1111)
([=]!:uuid:1111)/$is$ref/(=markus)
[=]!:uuid:1111[<#email>]<!:uuid:1111>/&/"myemail1@test.com"
[=]!:uuid:1111[<#email>]<!:uuid:2222>/&/"myemail2@test.com"
[=]!:uuid:1111[<#email>]<!:uuid:3333>/&/"myemail3@test.com"

Graph after the Star Shift:

(=markus)/$ref/(=!:uuid:1111)
(=!:uuid:1111)/$is$ref/(=markus)
=!:uuid:1111[<#email>]<*!:uuid:1111>/&/"myemail1@test.com"
=!:uuid:1111[<#email>]<*!:uuid:2222>/&/"myemail2@test.com"
=!:uuid:1111[<#email>]<*!:uuid:3333>/&/"myemail3@test.com"