SDF: Insert feature would lose default value if that property is readonly

[lind]

SDF Provider will not setting the defaut value of a property is that property is readonly.

In Autocad Map3D when creating a SDF with a property with default value and readonly is true, then the features in this SDF created will lost the default values. And also, bulk copy makes the target SDF lost the default values even the sources are correct.

[romicadascalescu]

The code change was reverted, and need to be fixed in next release

[romicadascalescu]

Fixed using a different ticket, see: Ticket #613 SDF: Handle read-only files and default values