Release SkyPat v3.1.1-Bourbon

1. Remove the white paper due to license issues.
2. Replace pat by SkyPat in the LICENSE file.
3. Make sure that all files' licenses are based on the LICENSE file.

Debian package

• See https://packages.debian.org/buster/libskypat-dev

Release SkyPat v3.1(Bourbon)

Executive Summary:

1. Change some files to fit Debian's policy.
2. Provide ASSERT and EXPECT macros with error messages.
3. Replace Pat/PAT by SkyPat/SKYPAT to unify our project name.

Change some files to fit Debian's policy:

1. Remove some documents with license issues to fit Debian's policy.
2. Remove our homemade debian folder to fit Debian's policy.

Release v3.0-Aquavit

1. Support all general perf_events.
2. Change the interface of PERFORM macros.