Eman-deps updated to v29

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shadow walker

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Sep 20, 2021, 10:57:07 PM9/20/21

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The version of eman-deps has been updated to version 29. The code on master uses this new version for binary builds. Developers need to create a new environment with the new dependencies following the updated instructions on the wiki after pulling master from GitHub. Some important changes:

- The channel priority has changed, conda-forge is higher priority than defaults. The wiki instructions reflect this change.

- Boost version has been updated from 1.69 to 1.74.

- OpenMPI has been updated from 3 to 4.

- The updated version of boost was compiled with newer C++ abi, so the compilation of EMAN on Linux has been updated to use the new abi. An important consequence of this is that the stock GNU compilers of CentOS 6 and 7 (dual C++ abi is disabled on those) are not going to work anymore.