randi usage in load_all_transformations causes trouble for compiled runs

[trautmane]

The usage of randi here:

https://github.com/khaledkhairy/EM_aligner/blob/master/renderer_api/load_all_transformations.m#L10

causes problems when I run concurrent compiled solve_montage_SL processes on the same cluster node. Apparently, compiled Matlab binaries bake in the random generator seed so concurrent runs will get the same sequence of "random" numbers (see https://www.mathworks.com/matlabcentral/answers/104306-why-does-my-compiled-rand-function-give-the-same-values-every-time-i-run-my-matlab-generated-standal).

It would help to have the intended-to-be-unique-per-run file names include hostname and process id information to reduce the chance of namespace collisions. I see Matlab includes a getpid function (https://www.mathworks.com/help/symbolic/mupad_ref/getpid.html). Another option is to create a unique "work" directory within the user specified temp_dir or dir_scratch for each run - then you don't need to worry about unique names within the run "work" directory.

@davidackerman - I'm hoping you might get the chance to address this at some point but it is not critical since I've worked around it for now.