Generate unique name for each detail

[Roman Telezhynskyi]

In some cases users forget to change name for a detail. Even if unique name is not required sometimes it is become handy to have unique names from the start. It is become very important if you insert into piece or export to dxf. In case of dxf some implementations even doesn't like blocks with the same name.

[Roman Telezhynskyi]

Resolved issue #790. Generate unique name for each detail.

→ <<cset 1c2a54a12670>>

[Roman Telezhynskyi]

Issue #791 was marked as a duplicate of this issue.

[Roman Telezhynskyi]

Removing milestone: v0.6.0 (automated comment)