Makefile: fix a bug with making deb (segfault) and adding proper licensing notice

This commit fixes a bug with making the deb package, that produced while executing apt install : 

    # apt install ./debian/tyto.deb 
    Segmentation faultsts... 0%

Also with dpkg : 

    # dpkg -i ./debian/tyto.deb 
    dpkg: error processing archive ./debian/tyto.deb (--install):
     unable to open file '/var/lib/dpkg/tmp.ci//debian': Is a directory
    Errors were encountered while processing:
     ./debian/tyto.deb

This bug was caused by a malformed tar construction.

Makefile

@@ -1,12 +1,23 @@
 #!/bin/bash
+#
+#  Copyright (C) 2023-2024 Adrien Bourmault <neox@a-lec.org>
+#
+#  This file is part of tyto-litterateur.
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU Affero General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU Affero General Public License for more details.
+#
+#  You should have received a copy of the GNU Affero General Public License
+#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-# file: Makefile
-
-# By neox
-
-# License: GNU AFFERO GENERAL PUBLIC LICENSE Version 3, 19 November 2007
-
-default: debian/tyto.deb
+default: tyto.deb
 
 ### MAKE DEB
 
@@ -14,14 +25,14 @@ default: debian/tyto.deb
 
 .PHONY: clean
 
-debian/tyto.deb: debian/debian-binary debian/control.tar.gz debian/data.tar.gz
-	ar -r debian/tyto.deb debian/debian-binary debian/control.tar.gz debian/data.tar.gz
+tyto.deb: debian/debian-binary debian/control.tar.gz debian/data.tar.gz
+	cd debian && ar -r ../tyto.deb debian-binary control.tar.gz data.tar.gz
 
 debian/data.tar.gz:
 	cd src && tar czvf ../debian/data.tar.gz usr var
 
 debian/control.tar.gz:
-	tar czvf debian/control.tar.gz debian/control #preinst postinst prerm postrm
+	cd debian && tar czvf control.tar.gz control #preinst postinst prerm postrm
 
 debian/debian-binary:
 	echo 2.0 > debian/debian-binary
@@ -29,4 +40,4 @@ debian/debian-binary:
 clean:
 	-rm debian/*.tar.gz
 	-rm debian/debian-binary
-	-rm debian/*.deb
+	-rm *.deb