works around a warning from protobuf: ByteSize() deprecated use ByteSizeLong() (Note downcast: protobuf SerializeToArray() still uses int)

minors: protobuf upgraded (syntax version explicit); MySql->MariaDB names changed; objectfiles before libs

The option make tar is added to Makefile

This is the final version of 1.0.0 of the data_exporter based on
the last commit by M.de Marco