First preview release

"Hugs-May2019" preview release:

• Implementation of Foreign Import Wrapper for X86_64. (GLUT/OpenGL works properly under x86_64 now)
• Various bugfixes
• Update to Base-4.0 and related packages.
• Update of utilities, include cabal/cpphs/hsc2hs, etc.
• Initial support for happy, hscolour, etc.

Checksum:
MD5: 6c56fb6b5b4b3ec6cf4c2bf6f3c12a5d
SHA1:6d23b9ebf380e51e5a9e37840c376ef0da7c3bb4
SHA256:7a5955c66f9974c8af17c5765a5b1542cb6e6cdf4f69e3a19dbfb5bcdbb0b8b9