逆形式泊松方程的边界约束

[Gravifer]

在 #3 所描述的椭圆方程求解中, 需要在每个迭代步施加边界条件.
应当将这实现为名为 xx_boundary_conform 的函数的方法.
应当实现的类别有:

• Dirichlet 边界条件
• Neumann 边界条件
• 周期边界条件
• (optional) 自然边界条件

[stale]

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