Removes MemoryType.Strict and Safe tests from TreeDictionary
Removes MemoryType.Strict and Safe tests from TreeDictionary

Strict and Safe have not been implemented yet in TreeDictionary as well
as in RedBlackTree. An exception is risen on purpose if those two data
structures are tried to be used with such memory model. Thus unit tests
have been removed

nbasakuragi/C5,sestoft/C5