Old TL/1 and TL/2 compilers removed

The TL/1 and TL/2 compilers have been superseded for some time now by the self-verifying BurmTest series of basic acceptance tests and by the Falcon compiler as a larger-scale test.

Now that Falcon is available as open source software, these early test compilers are no longer maintained (and TL/1 has become confused with a protocol by the same name), so they have been removed.