Release 0.6.1

See https://www.gnu.org/software/libredwg/ and NEWS

0cd87edbcd25c5ae606e68e3b5233716ef808ac995df29d92acd13606a528967  libredwg-0.6.1-win32.zip
d509f46c98bddba30c030a8ee57c70314ddc23bc402fac379645fafab8c5c2e5  libredwg-0.6.1-win32.zip.sig
e76e791d20a91864d5fa3af070e746e5d0e0bb80aee2ce5f7ee39670e49b1dde  libredwg-0.6.1-win64.zip
fdc735ee4566ed2dc6d11e83e376b7c58fbddab6bfa3f4733aebf104e2ba8d13  libredwg-0.6.1-win64.zip.sig
290e315f8215e18520587cdb70810b57b78ffe1f28a9d54117c30aa9d4d79403  libredwg-0.6.1.tar.gz
b2f518e28c8af4c9bb80f702cc92189aa9cd92b9fc1f48a0bc9cd703e27d519d  libredwg-0.6.1.tar.gz.sig
dc15dc0074415e2fe3f562a3dc2a826e85589074cd7d46f5edd04baf731e9f36  libredwg-0.6.1.tar.xz
b025878953ee5cca74023fd7052897cdeeef9d0c74210de61406da3112b62cec  libredwg-0.6.1.tar.xz.sig

First, be sure to download both the .sig file
and the corresponding tarball. Then, run a command like this:

gpg --verify libredwg-0.6.1.tar.gz.sig

If that command fails because you don't have the required public key,
then run this command to import it:

gpg --keyserver keys.gnupg.net --recv-keys B4F63339E65D6414

and rerun the 'gpg --verify' command.