Add MPL header

nbproject/mplheader.txt

@@ -0,0 +1,9 @@
+<#if licenseFirst??>
+${licenseFirst}
+</#if>
+${licensePrefix}This Source Code Form is subject to the terms of the Mozilla Public
+${licensePrefix}License, v. 2.0. If a copy of the MPL was not distributed with this
+${licensePrefix}file, You can obtain one at http://mozilla.org/MPL/2.0/.
+<#if licenseLast??>
+${licenseLast}
+</#if>

nbproject/project.properties

@@ -1,6 +1,7 @@
 auxiliary.org-netbeans-modules-html-editor-lib.default-html-public-id=-//W3C//DTD HTML 4.01 Transitional//EN
 include.path=${php.global.include.path}
 php.version=PHP_70
+project.licensePath=./nbproject/mplheader.txt
 source.encoding=UTF-8
 src.dir=.
 tags.asp=false