Match linked list tests with the current API.
Fix name conflict between two tests

* There is a SimpleTest in AlertTest.cpp, and an UnitTest in
balert/AlertTest.cpp. They ended up with the same grist as they are
built from the same jamfile. Rename one of them to avoid this.
Don't include number_format tests

* The class isn't currently included in Haiku
* Test test only checks that the constructor doesn't crash, which isn't
very helpful anyway
Fix gcc4 build.