* eospac: add version 6.4.2beta
* eospac: clarify EOSPAC "beta" versions
Compared to 6.4.1, EOSPAC 6.4.2beta contains only one change, a fix
for an inability to read some SESAME files in ASCII format. From the
release announcement,
EOSPAC 6.4.2beta has been released for general use as the latest
(i.e., eospac6-latest) versions. This is a small patch to the
previously-released version 6.4.1, which was requested by an
affected user.
But the "beta" label can cause confusion, especially when a beta
version is the new preferred version, as is the case here. As
suggested by reviewers, add a comment clarifying EOSPAC's use of
"beta".
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