dot-like operations and calls

[markspanbroek]

Thanks, I can do that. In previous versions I actually called the operator 
`?.`, but I moved away from it because of its low precedence. It does mean that 
users of the library will need to use extra parentheses in some places. For 
example, expressions such as `if a =? b.?c:` would become `if a=? (b.?c):`.