fix detection of Keynote 3 documents

Change-Id: I1c3e6b2809ee8b63f6f4db886bf6358b668b505f
enable integration test for libmwaw calc import

Change-Id: I9ff3ed6b74d93483a2157087707c5ec47888dd6a
enable integration test for libmwaw draw import

Change-Id: I2109b948971776f06c3574ad6e7a9bebc33a40b3
these formats are supported by libmwaw 0.3.x

Change-Id: Ie045a3d700d498d58bad1bfcaf4cfd81b63005a6