Duplicate IDs with same attributes but different names do not raise exceptions

[StokesMIDE]

If an EBML ID is reused for another element, importing the schema will only raise an exception if either the base element type is different or the element's attributes differ. The element name should also be considered.

Implementation detail: this might be easily solved by just explicitly adding the name to the list of attributes in Schema.addElement() (somewhere around here: https://github.com/MideTechnology/ebmlite/blob/development/ebmlite/core.py#L1201-L1207)