fix segmentation fault taking its origin during IpatchDLS2 to file conversion

[jjceresa]

This PR fixes issue https://github.com/swami/swami/issues/55 point 2.3.

• Because bag data belongs to original IpatchDLS2 object, when newinfo will be freed this will corrupt original IpatchDLS2.
• Then, attempting to save this original IpatchDLS2 corrupted object a second time leads to a segmentation fault.