Request to slightly improve add grid way point comand

[AndMetal]

The original code didn't work as intended, but I had a chance to compile & debug, and this is what I came up with.

In zone/zonedb.h around line 215 (under the Grids/Paths heading), add

	int		GetHighestWaypoint(uint32 zoneid, int32 gridid);

In zone/waypoints.cpp around line 1300 (the end of the file), add

int ZoneDatabase::GetHighestWaypoint(uint32 zoneid, int32 gridid) {
	char *query = 0;
	char errbuff[MYSQL_ERRMSG_SIZE];
	MYSQL_RES *result;
	MYSQL_ROW row;
	int res = 0;
	if (RunQuery(query, MakeAnyLenString(&query,
		"SELECT COALESCE(MAX(number), 0) FROM grid_entries WHERE zoneid = %i AND gridid = %i",
		zoneid, gridid),errbuff,&result)) {
		safe_delete_array(query);
		if (mysql_num_rows(result) == 1) {
			row = mysql_fetch_row(result);
			res = atoi( row[0] );
		}
		mysql_free_result(result);
	} else {
		LogFile->write(EQEMuLog::Error, "Error in GetHighestWaypoint query '%s': %s", query, errbuff);
		safe_delete_array(query);
	}

	return(res);
}

And in zone/command.cpp around line 2345, change

void command_wp(Client *c, const Seperator *sep)
{
	if (strcasecmp("add",sep->arg[1]) == 0)
		database.AddWP(c, atoi(sep->arg[2]),atoi(sep->arg[4]), c->GetX(), c->GetY(), c->GetZ(), atoi(sep->arg[3]),zone->GetZoneID());
	else if (strcasecmp("delete",sep->arg[1]) == 0)
		database.DeleteWaypoint(c, atoi(sep->arg[2]),atoi(sep->arg[4]),zone->GetZoneID());
	else
		c->Message(0,"Usage: #wp add/delete grid_num pause wp_num");
}

to this

void command_wp(Client *c, const Seperator *sep)
{
	int wp = atoi(sep->arg[4]);

	if (strcasecmp("add",sep->arg[1]) == 0) {
		if (wp == 0) //AndMetal: default to highest if it's left blank, or we enter 0
			wp = database.GetHighestWaypoint(zone->GetZoneID(), atoi(sep->arg[2])) + 1;
		database.AddWP(c, atoi(sep->arg[2]),wp, c->GetX(), c->GetY(), c->GetZ(), atoi(sep->arg[3]),zone->GetZoneID());
	}
	else if (strcasecmp("delete",sep->arg[1]) == 0)
		database.DeleteWaypoint(c, atoi(sep->arg[2]),wp,zone->GetZoneID());
	else
		c->Message(0,"Usage: #wp add/delete grid_num pause wp_num");
}