Create assign instruction and return variables in result
Add acceptance tests
Remove java compilation warning
fix tests
fix acceptance tests
merge
format
Merge pull request #525 from antoine-aumjaud/features/FIT-SetSymbolInStoreFromExpectation

Slim Query/Table Table: manage variables assignment in VariableStore
Increment Slim server version. Raise exception if assign instruction is called for slim server version < 0.4.
Small protocol update (wiki) and cleanup in code.
Merge pull request #525 from antoine-aumjaud/features/FIT-SetSymbolInStoreFromExpectation with protocol change addition.