Test all promotions of primitive types are handled correctly

[ftomassetti]

We should:

• introduce long literal
• introduce byte literal
• introduce short literal
• introduce float literal
• introduce a sort of cast (getA() as int, getB() as long) for primitive type conversions
• test automatic conversion from int to long (var long a = getInt())
• test automatic conversion from short to long (var long a = getShort())
• test automatic conversion from byte to long (var long a = getByte())
• test automatic conversion from short to int (var int a = getShort())
• test automatic conversion from byte to int (var int a = geByte())
• test automatic conversion from byte to short (var byte a = getByte())
• test automatic conversion from float to double (var double a = getFloat())