Check IDLReasoner performance issues to avoid showcase freezing

[AML14]

Things to do:

• Include some logging. If a test is tried to be generated +10 times, throw a warning.
• Check that children processes are correctly killed (this should be already fixed).
• Include helper method to reset string-to-integer mapping. For every RESTest iteration, this method should be called. This will avoid IDLReasoner having to deal with (and keep in memory) a map with thousands (even millions...) of entries.