boot.js: formatting
boot.js: add package Kernel-Infrastructure where due
boot.js: shorter .initClass
boot.js: more robust "no subclass" detection in addClass machinery
boot.js: extract wireKlass
boot.js: copying to new array in readJSObject
boot.js: better "nil is subclass" message
Merge pull request #1018 from herby/bootjs-small-fixes

boot.js small fixes