Accept '-' in StringToInt.
Added a first version of the Pickle module.
Got rid of BootBase.oz, by putting more bootstrap in Init.oz.
Changed the implem of BootURLLoad to use Boot_OS.bootURLLoad.
Changed the pickle strategy to avoid delayed constructions.
Reconciled the pickle and boot-pickle formats.
Optimized AdjoinAt with adjoinAtIfHasFeature.
Use property 'oz.search.boot' as an additional cache resolver.
merge