Clean up old style error messages

[karlnapf]

We have many instances of something that looks like

SG_ERROR("%s::create_merged_copy(): Could not cast object of %s to same type as %s\n",get_name(), other->get_name(), get_name());

This task is to remove the %s::method_name and corresponding get_name(), as we can now use an internal loglevel to autogenerate this context, i.e. change it to

SG_ERROR("Could not cast object of %s to same type as %s\n",other->get_name(), get_name());

Grep for %s:: to find them. Super easy entrance task

Also, this particular error message is an example of a bad error message. They can also be cleaned up to something like

REQUIRE(other, "No feature object given.\n");
SG_ERROR("Given feature object (index %d, type %s), must have the same type as this instance (%s) %s\n", i, other->get_name(), get_name());

[aby0]

Can I work on this issue?

[karlnapf]

Sure no need to ask