[trunk/7.0/6.1] [account_asset] Account move lines generated with incorrect names

This bug is similar to others reported, but more focused in only one of the current problems in the module. This has been reported before on this bug on the point 4:

https://bugs.launchpad.net/openobject-addons/+bug/1019932

The problem is that when you generate move lines for one asset, for example:

  - Name: Asset 1
  - # of depreciations: 8

generated account moves have these data:

  - Name: Asset 1, instead of / (empty), that will be filled with the corresponding sequence number when you post the move.
  - Reference: x/y, where x is the id of the asset!!, and y is the number of the depreciation, where it must be for this example 1/8, 2/8, 3/8 or in general <position_of_depreciation>/<total_number>.

I'm attaching a simple patch for 7.0 that solves these problems.

Regards.