IS package evolution + removed import dependency on log path

Adds two new options for IS package import in connect:

• Local file (on client computer) and
• Remote file (on the web, supporting http authentication).

Imports store files at a dedicated location, either given with parameter "upload_path" at startup or by default in /tmp/synthese_tmp_storage

closes http://git.rcsmobility.com/rcsmobility/synthese/issues/1080 closes http://git.rcsmobility.com/rcsmobility/synthese/issues/1060