Remove predict

[adscib]

This is a suggestion from Brooks, which I support, to remove @predict in favour of standard return. It accomplishes the same goal without introducing new syntax. Also the experience of Anglican team indicates that people often associate @predict with the posterior predictive distribution, which is clearly not what it is.

[yebai]

It is OK to rename it, any ideas?

[xukai92]

@request or @output sound more natural for the purpose of this macro.

[adscib]

Renaming is certainly possible, but do we need this macro at all? Can't we just use return? Adam