修改了一下笔的算法，对极个别特殊结构图形放宽笔的限制（小于4根也成笔）。使其图形结构更利于分析。 升级方法：仅需更新mzjc.dll，其他无需更改。(Modify your pen algorithm, very few special structure relaxation limit graphics pen (less than 4 root as the pen). Make its graphic structure more favorable for analysis. Upgrade method: only need to update mzjc.dll, others do not need to change.)