Cleaned up old tests.
Deleted point_order because X values implicitly state order.
Fixed a problem where some parameters were accidentally being overwritten.
Fixed an invalid test. The test was invalid because, by omitting the production type from the <basic-destruction-model> element, it made that element and its contained priority number implicitly apply to all production types, and that violated this statement fro the model specification: "No two production-type/reason for destruction combinations can have the same priority."
Added support for <trace-back-destruction-mode> elements.
Bugfix for loglogistic distribution: variance is undefined if shape parameter <= 2.0, not 1.0 as previously written in the code.
Merge branch 'master' into SQLite