Tests with extension .tt

[elliottslaughter]

I just noticed there are two tests with the extension .tt. I'm not sure what the intention was, but I'm guessing these aren't being run right now.

$ ls ../tests/*.tt
../tests/emptytag.tt	../tests/tag.tt

[elliottslaughter]

Looking in more depth, these are both tests that use #!../terra. This obviously does not work if Terra is not located precisely at ../terra. In fact there is a commit 0540bdd that seems to indicate as much. This is even more true with CMake, where the build directory could be located anywhere.

The only way I see to fix it is to use /usr/bin/env terra and make sure the Terra binary is on PATH. But I'm not really sure if it's worth the trouble.

Overall I don't think we're losing much by not having these tests.