Use id_pm as default value for id_pm_head in personal_messages

This change emulates the personal message threading scheme
used by SMF 1.1 to 2.0 upgrade script. It simply creates a
separate thread for each message. Without this change, all
imported messages get grouped into the same null message
thread.

Signed-off-by: Noteworthy Software, Inc <online@noteworthysoftware.com>
Merge pull request #36 from nwsw/smf11fix

Use id_pm as default value for id_pm_head in personal_messages (SMF 1.1 -> ElkArte)
! Added basic Viscacha Importer.
Signed-off-by:Thorsten Eurich <thorsten@eurich.de>
! Added pm and moderators import (viscacha importer)
Signed-off-by:Thorsten Eurich <thorsten@eurich.de>
! removed ICQ import (viscacha importer)
Signed-off-by:Thorsten Eurich <thorsten@eurich.de>
! Added polls & votes (viscacha importer)
Signed-off-by:Thorsten Eurich <thorsten@eurich.de>
! Added attachments, avatars and topic notifications (viscacha importer)
Signed-off-by:Thorsten Eurich <thorsten@eurich.de>
Merge pull request #37 from eurich/viscacha

Viscacha importer