* In btest.cfg, option values can now include commands to execute in
backticks.
Example:
[environment]
CC=clang -emit-llvm -g `hilti-config --cflags`
* Limiting substitutions to replacing whole words.
* Adding "substitutions". Substitutions are similar to filters, yet
they do not adapt the input but the command line being exectued.
See README for more information.
* Instead of giving a test's file name on the command line, one can
now also use its "dotted" name as it's printed out when btest is
running (e.g., "foo.bar"). That allows for easier copy/paste.
* Starting CHANGES.