rem: std::string kvu_numtostr (signed char c) {  return kvu_numtostr((int)c); }
add: std::string kvu_numtostr (unsigned int n) { char ctmp[12]; snprintf(ctmp, 12, "%u",n); ctmp[11] = 0; return(std::string(ctmp)); }
context: std::string kvu_numtostr (signed char c) {  return kvu_numtostr((int)c); }