merge twm 1.0.13.1.

initial import of twm-1.0.13.1

merge mkfontscale 1.2.2, twm 1.0.12, xauth 1.1.2, and xdm 1.1.13.

initial import of twm-1.0.12

Use the upstream-friendly version sent upstream.

Upstream would prefer to use __datadir__ because it's defined by
automake, and the default path used for installing system.twmrc.

Use the correct path for the twm.systemrc file.

Thanks robert for the heads up.

initial import of twm-1.0.10

initial import of twm-1.0.9

initial import of twm-1.0.8

initial import of twm-1.0.7

initial import of twm-1.0.5

initial import of twm-1.0.4