Release v0.4.0 on 2018-05-03.

1. c2ba427 tests: Migrate convtest util to autotest infrastructure by Pau Espin Pedrol · 6 years ago
2. 4ebb289 utils/convolvtest: Remove uneeded libosmocore dependency by Pau Espin Pedrol · 6 years ago
3. e8ae9fc buildenv: Split up SSE3 and SSE4.1 code by Philipp Maier · 7 years ago
4. dfe0aef Add test program to verify convolution implementation by Philipp Maier · 7 years ago
5. 72e8619 Checking in clockdump.sh utility. by Alexander Chemeris · 9 years ago