MultiSimhash

[orapic]

Add the possibility to concatenate simhashes to make a larger one.

This way one can make a sort of "signature" where multiple simhashes are combined into one. Also made the tests for it.

Example with 4 simhashes of 32 bits:

input_to_concat = [simhash1, simhash2, simhash3, simhas4]
new_simhash =  MultiSimhash(input_to_concat)

[1e0ng]

Hi @orapic, Thanks for the PR! I can see one build failed. Could you check the cause and fix it?

[orapic]

Ok, should be fixed now.