v2.5.2: Fixes for volcanic emissions

This tag has configuration for GEOSgcm v11

This release has fixes for v2.5.1 involving volcanic emissions.

Non-zero-diff to v2.5.1

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Fixed

• There was a bug where the degassing lat/lon were used to assign emission points for
  explosive volcanic SO2 emissions; this has been corrected.
• There was a bug where the scaling of explosive volcanic SO2 emissions was mistakenely
  being applied to the degassing (effectively further doubling the degassing and not
  correctly scaling the explosive; this has been corrected.

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What's Changed

• v2.5: Backport volcanic emissions fix by @mathomp4 in #424

Full Changelog: v2.5.1...v2.5.2