Implement unpickling of unicodeString in bootunpickler
Implement unpickling of unicodeString in bootunpickler

* Also add an error message when type is unknown.

Angeldude/mozart2,dianacgr/mozart2,eregon/mozart2,eregon/mozart2,eregon/mozart2,mozart/mozart2,yjaradin/mozart2,dianacgr/mozart2,Angeldude/mozart2,dianacgr/mozart2,layus/mozart2,layus/mozart2,yjaradin/mozart2,layus/mozart2,yjaradin/mozart2,mozart/mozart2,Angeldude/mozart2,mozart/mozart2