Slave instances are again in intereset.

This reverts commit de713c10.

This reverts commit a9f93ac6.

Confirm became meaningless.

Let vifib_erp5 pull all vifib_* dependencies, including vifib_base,
which will fetch all erp5_* dependencies.

Sale Orders can be confirmed, by SaleOrderLine_tryToAllocatePartition will not
allocate if not possible.

vifib_open_trade shall depend on erp5_open_trade, this is logical.

Person shall have validated Open Order created. Empty one assuers, that nothing
is to do for given Person.

vifib_base configures Item portal type provided by erp5_item

There is path in vifib_open_trade which requires Accounting Period portal type.

Conflicts:
	master/bt5/vifib_upgrader/bt/revision

Use query syntax.

Hosting Subscription periodicity shall be set when there is related at least
started instance setup delivery.

Periodicity shall be set on document related with Open Sale Order Line

Confirmed Sale Order Line shall have Computer Partition.

Open Order modification is a bit more optimised.

Prove that Subscription Item periodicity is correctly defined.

Start at least *today* and if date is in day number higher then minimum amount
of days in month *rewind* and do not fast forward.

Store processed date.

Periodicity is known when service is available.

Add dates safely using DateUtils.
Round up start_date to next midnight.
In case if after rounding this date would go higher then minimum number of day
in month set it to next month beginning date.