cppcheck Files

Bug fixes:

 - Better handling of namespaces
 - Fixed false positives
 - Fixed parsing of compile databases
 - Fixed parsing of visual studio projects
 
Enhancements

 - New check; Detect mistakes when there are multiple strcmp() in condition
   Example:
     if (strcmp(password,"A")==0 || strcmp(password,"B")==0 || strcmp(password,"C"))
   There is a missing '==0', and therefore this condition is always true except when password is "C".

 - New check; pointer calculation result can't be NULL unless there is overflow
   Example:
     someType **list_p = ...;
     if ((list_p + 1) == NULL)
   The result for '(list_p + 1)' can't be NULL unless there is overflow (UB).
 
 - New check; public interface of classes should be safe - detect possible division by zero
   Example:
     class Fred {
     public:
     void setValue(int mul, int div) {
       value = mul / div; // <- unsafe
     }
     ...
   This check does not consider how Fred::setValue() is really called.
   If you agree that the public interface of classes should always be safe; it should be allowed to call all public methods with arbitrary arguments, then this checker will be useful.

 - Fixed a few false negatives
 
 - More information in the cfg files