refactor: 项目目录结构重组

- 中文目录名改为英文：cDNA图像处理实例→examples，参考资料→references
- web→app（Flask应用标准命名）
- 输出目录平移到 data/output/simple/ 和 data/output/full/
- 输入图像统一到 data/input/
- 构建脚本移到 scripts/
- 源码文件改用 snake_case 命名
- 更新所有文件路径引用和文档

references/matlab/limits.m

@@ -0,0 +1,29 @@
+function [x,y]=limits(a)
+% LIMITS returns min & max values of matrix; else scalar value.
+%
+%   [lo,hi]=LIMITS(a) returns LOw and HIgh values respectively.
+%
+%   lim=LIMITS(a) returns 1x2 result, where lim = [lo hi] values
+
+% Copyright 2004-2010 RBemis The MathWorks, Inc. 
+
+if nargin~=1 | nargout>2 %bogus syntax
+  error('usage: [lo,hi]=limits(a)')
+end
+
+siz=size(a);
+
+if prod(siz)==1 %scalar
+  result=a;                         % value
+else %matrix
+  result=[min(a(:)) max(a(:))];     % limits
+end
+
+if nargout==1 %composite result
+  x=result;                         % 1x2 vector
+elseif nargout==2 %separate results
+  x=result(1);                      % two scalars
+  y=result(2);
+else %no result
+  ans=result                        % display answer
+end