AutoCode allows multiple "+" at the end

Now, with multiple plus signs at the end, minimum length of numeric
suffix can be defined.
AutoCode - suffix defined length test

Added test for suffix defined length feature (multiple plus signs at the
end of template code).
AutoCode for Integer properties, multiple AutoCode on same Entity
AutoCode - Additional test

Test for AutoCodeForEach on Integer properties
Merge branch 'master' of https://github.com/davorpr1/Rhetos
More AutoCode unit tests.