[Developers] remove dependency of NaNChecker from MoL

[Thomas Radke]

Jian Tao wrote:
> Hi,
> 
> Currently, MoL explicit requires NaNChecker. It is better to 
> remove the dependency of NaNChecker from MoL by using an alias 
> function.
> 
> ----------------------------------------------------
> In the interface.ccl of MoL
> ---------------------------
> USES FUNCTION CheckVarsForNaN

In order to keep runtime backwards compatibility MoL should REQUIRE 
FUNCTION CheckVarsForNaN.

There is no convention about names for aliased functions but I suggest 
to prefix them with the name of the providing thorn/implementation.

> In the interface.ccl of NaNChecker
> ----------------------------------
> PROVIDES FUNCTION CheckVarsForNaN WITH NaNChecker_CheckVarsForNaN 
> LANGUAGE C

For completeness, NaNChecker should provide its full API via aliased 
functions.

-- 
Cheers, Thomas.