Import tre from https://github.com/laurikari/tre as of 10171117:

- tre_reg*b() functions are added, that take bytes literally.
- minor bug fixes

initial import of tre-0.8.0 into the external sources framework.

with many thanks to ville laurikari for writing tre in the first place
and for changing the licensing to a 2-clause bsd license; than

initial import of tre-0.8.0 into the external sources framework.

with many thanks to ville laurikari for writing tre in the first place
and for changing the licensing to a 2-clause bsd license; thanks also to
matthias-christian ott for his work on the google summer of code 2009
project.

this import brings the distribution to src/external - the reachover
build files will follow

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