Fixed CASTOR exceptions so they carry a meaningful serrno (SEINTERNAL).

castor/exception/Exception.cpp

@@ -36,7 +36,7 @@ castor::exception::Exception::Exception(int se, std::string context) :
 // constructor
 //------------------------------------------------------------------------------
 castor::exception::Exception::Exception(std::string context) : 
-  m_message(context), m_serrno(0){}
+  m_message(context), m_serrno(SEINTERNAL){}
 
 //------------------------------------------------------------------------------
 // copy constructor

castor/tape/tapeserver/exception/Exception.hpp

@@ -33,7 +33,7 @@ namespace castor {
 namespace tape {
   class Exception: public castor::exception::Exception {
   public:
-    Exception(const std::string& what): castor::exception::Exception(0) { setWhat(what); }
+    Exception(const std::string& what): castor::exception::Exception(SEINTERNAL) { setWhat(what); }
     // Copy operator needed to throw anonymous instance (throw myClass("some failure."))
     Exception(const Exception &ex);
     virtual ~Exception() throw() {};