[Developers] Patch: [cctk_WarnLevel.h and WarnLevel.c]: to register the callbacks call them

[Jian Tao]

Hi,

Four new functions are declared in cctk_WarnLevel.h together with the macros 
to enable users to register their own functions to  take care of Info/Warn 
message. The main purpose is to provide a generic interface to deal with 
Info/Warn message. 

A sample thorn is also ready and was used to test the those four functions.

Cheers,
Jian

###########################################################
int CCTK_WarnCallbackRegister(int minlevel,
                              int maxlevel,
                              void *data,
                              void callback(CCTK_DECLARE_WARN_CALLBACK_ARGS));
                              
int CCTKi_WarnCallbacksCall(CCTKi_DECLARE_WARN_CALLBACKSCALL_ARGS);

int CCTK_InfoCallbackRegister(/*int minlevel,
                              int maxlevel,*/
                              void *data,
                              void callback(CCTK_DECLARE_INFO_CALLBACK_ARGS));
                              
int CCTKi_InfoCallbacksCall(CCTKi_DECLARE_INFO_CALLBACKSCALL_ARGS);
###########################################################

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