Tarmux v1.0.2

Bugfix release of v1.0.2 of tarmux.

*) Explicitly check that the first fragment is fragment zero,
and complain very loudly if it is not.

*) Tighten error handling in tardemux.

SHA256 hashes:

c7cb40448a956230d3b27f31dca2ebb5a5b5e0628fff9622aefe47e3084bddd3  tarmux-1.0.2-1.fc23.src.rpm
a93886fb281c5a52c8ca8f709a0ccacaa9593a3641a486ab2909691cd6251a77  tarmux-1.0.2.tar.bz2
9965658942870709412111c29cec15519d1fa0cd9e008a65e898767367a28ba1  tarmux-1.0.2.tar.gz