Merge branch 'tuleap-7.6-x' of tuleap.net:tuleap/tuleap/stable into tuleap-7.6-x

* 'tuleap-7.6-x' of tuleap.net:tuleap/tuleap/stable:
  Please do not forget debian changelog
Fix request #7541: TV3 to TV5 : bad path in attachments path migration

Change-Id: I164bd60caca1f0d21c110a87d148efe1a06df653
request #7535 TV3 to TV5 : a float field with no value generate errors in XML import

Deal with NULL values for float and int fields

Change-Id: Iddd5a6f2327607f1e6f721136e9656e0ee970016
Fix request #7573: sftp browser information: wrong size unit shown

Change-Id: I7ab513be7dd82e6580d8b20b7ae5d4dd8d0bd725
Tuleap 7.6-3

Change-Id: Ic32ea0b8eec6775812bb100bd74222a76cefa7da