add parse layer link section

[iamgqb]

add layer link section; layer link represented by array in psd;
for example:
1.

layer3 and layer1 are linked;

then the array is [1, 1, 0]

2 if there are more layer links

layer3 and layer1 are linked; layer4 and layer2 are linked;

then the array is [1, 2, 0, 1, 2]

3 if there are some group layer ,but not linked;

layer3 and layer1 are linked; layer4 and layer2 are linked;

then the array is [ 0, 1, 2, 0, 0, 1, 2 ];

yes, we find group layer create 2 element in the array; here, I call them groupStart and groupEnd;

4 if there are some group layer, and they are linked;

layer3 and layer1 are linked; layer4 and layer2 are linked; folder1 and layer5 are linked;

then the array is [ 3, 1, 2, 0, 3, 1, 2 ]; we find the groupStart is not zero, and the groupEnd also is zero;

Through the above,find:
same linked layers , they have same number, not zero;
group layer has two numbers, and the groupEnd always zero;

OK, through some processing we could get which layer are linked mutually

[meltingice]

This is a great start, thanks! Would be great to add functionality to the Node classes that lets you determine whether 2 nodes are linked without having to work with this array directly, too.

[xielijun]

how can i use it in my Browser Example?