default numerals.db location is now installed location

src/main.cpp

@@ -70,7 +70,7 @@ int main(int argc, const char * argv[]) {
         std::string lang {"en"};
         std::string start;
         int maxiter {0};
-        std::string db_path {"numerals.db"};
+        std::string db_path {"/usr/local/share/autogram/numerals.db"};
         unsigned int verbose {0};
         int opt_char, opt_val;
         struct option long_options[] = {