r17122 added copyright notice and COPYING.hunalign regarding these files; note the connection in the files themselves to avoid any confusion

git-svn-id: svn+ssh://svn.code.sf.net/p/apertium/svn/trunk/apertium@57227 72bbbca6-d526-0410-a7d9-f06f51895060
Allowing >> without emptying destination file

git-svn-id: svn+ssh://svn.code.sf.net/p/apertium/svn/trunk/apertium@57380 72bbbca6-d526-0410-a7d9-f06f51895060