iPart and iAssembly rename support

[#1]

We need to be able to rename iparts and iassemblies after they are created.  Currently when I try to do this, I get the message like "Operation failed.!  XYZ.ipt is a configuration memeber whose name is define by keys within a configuration factory".

We also need the ability to easily fix the iassemblies after the iparts are renamed.  Right now it is a nightmare to rebuild the iassemblies after the iparts are rebuilt.