Convert hzMonthrule enum value into text (for diagnostic purposes)

Declared and defined in file: hzCron.cpp

Function Logic:

Function body:

const char* Monthrule2Txt (hzMonthrule mrule)
{
   //  Category: Diagnostics
   //  
   //  Convert hzMonthrule enum value into text (for diagnostic purposes)
   //  
   //  Arguments: 1) mrule The valid hzMonthrule value
   //  
   //  Returns: Const reference to hzString as value being text form of the month rule
   if (mrule < 0|| mrule > HZMONTHRULE_INVALID)
       return _hzGlobal_Monthrules[HZMONTHRULE_INVALID] ;
   return _hzGlobal_Monthrules[mrule] ;
}