compiler/load: tlo version number increment,

The new tail call optimization relies on a fix to the
VM's block instruction. This means that .tlo files in which
TCO has been applied might not run correctly with
TXR 300 or older. For that reason, we bump up the version
number.

* parser.c (read_file_common): Accept version 8.0 files,
while continuing to allow 6 and 7 regardless of minor number.
We get picky about minor number so that in the future we
can use a a minor number increment for backward compatible
changes like this. We would only like to go to version 9 if
the VM changes in such a way that we cannot load 8 any more.
If we can still load 8.0, we would like to go to 8.1.

* stdlib/compiler.tl (%tlo-ver%): Change to 8.0.

* txr.1: Documented.

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