conf_test 0.3.0

Run configuration tests from build.rs and set available features
Documentation 
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# Rust conf_test

Run configuration tests from build.rs and set available features, similar to *autotools*
configure scripts.

# Description

`ConfTest::run()` called from 'build.rs' parses 'Cargo.toml'. Then for each *[feature]*
defined, it checks if that feature was not set manually (with `--features`) and a test in
'conf_tests/' exists. This test is then compiled and build. When that succeeds the
feature becomes enabled automatically.