Merge pull request #173 from eggrobin/plugin-tests

Plugin tests
Fix comment.
Merge branch 'master' into PluginTest
A death test and preprocessor changes.
ODEify
More death testing.
mergez la vache
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meuh
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Merge pull request #174 from pleroy/PluginTest

Error tests for InsertCelestial.  Fixes to the preprocessor directives.
cows
Correction post-vaque