fix test to use new test part substitution syntax
Use notation like precondition#1 for test part property names
demonstrate test part property replacement in the park calculator example
ignore empty strings in given parts
remove script precondition and script postcondition properties from description
support global preconditions and postconditions in java.xslt
remove unused import from generated test
use property names script.precondition and script.postprocessing for script global test steps
unify script parameter  handling
(script.driver, script.imports, script.precondition, script.postprocessing)
fix test part property names