New warnfixes (#2254)

* Fix clang warnings

* Remove vim tab guides

* initialize variables

* 'strncpy' output truncated before terminating nul copying as many bytes from a string as its length

* Fix ISO C++17 does not allow 'register' storage class specifier for outdated bison

* chars are unsigned on ARM, having  if (ival < 0) always false

* chars are unsigned by default on ARM and comparison with -1 if always true

dmlproc/batchinsertprocessor.cpp

@@ -547,4 +547,3 @@ void BatchInsertProc::getError(int& errorCode, std::string& errMsg)
   errMsg = fErrMsg;
 }
 }  // namespace dmlprocessor
-// vim:ts=4 sw=4: