selectfields: Select specified field names from a struct

Selects fields listed in a cell array from a struct. Optional third
argument suppresses error message if struct does not contain
given field.
Exmples:
struct2=selectfields(struct1,{list of field names})
Moves field names and corresponding field content from struct1 to
struct2.

struct2=selectfields(struct1,{list of field names},true)
Moves field names and corresponding field content from struct1 to
struct2 if field name exists in struct1. Error messages for
missing field nanes are suppressed

See also renamefields

See doc selectfields