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If the old generated .jl file and the new contents shared a common prefix, then
the output in the generated file would be truncated at the start.

Ref. #1

— do not overwrite generated .jl files if contents has not changed
— refactor the auxiliary variable/series files

Closes: #1

the model if it hasn't changed

function get_power_deriv is now in Dynamic and Static modules

Artifacts.toml must still be adapted for new version of preprocessor

— Adds support for “deterministic_trends”; as a consequence, run
  models/stochastic_trend_drift/trend1.mod to the testsuite
— The preprocessor now loads StatsFuns in its generated files, so add it to
  Project.toml (ref. #1)

factorize start and last initialization in front of the if statement

See merge request !1