Some hardware (cough, Alpao) might be very unhappy if values that are supposed to be AYLP_U_MINMAX are actually greater than 1 in magnitude.

We should add a device that clamps values within given bounds. Make sure to check the compiled code, and possibly special-case clamping to ±1 for optimization.

Alternatively, maybe this is an aylp_asdk_dm issue, and we should just do the check there. Comes down to the performance comparison and how often we expect to want to clamp things.

I just pushed some very simple unit testing (written in sh). However, it just crossed my mind that we should really migrate to Julia's Test library for this; it'd be much simpler and more powerful!

So, two related things:

1. Sometimes a loop might want to have multiple vectors/matrices/etc.; for example, maybe device A wants to output two things which are then read by devices B and C, or maybe device D wants to send something to device F, but without replacing the main pipeline state because device E needs it too.
2. The current paradigm for doing IPC between anyloop and e.g. a plotting program in Julia is to use a named pipe. However, this has two disadvantages:
   1. named pipes have a limited buffer size, so Julia will eventually start blocking anyloop
      • this is good for applications where we don't want to miss data, but not for e.g. a realtime view of a matrix
   2. named pipes involve copying to kernel space and back, which can be slow.

My current proposal is to fix both of these issues by using proper mmaped shared memory. There are a few considerations for this, however:

1. We can't use pointers in shared memory.
2. Care will have to be taken with regards to allocating GSL objects to make their underlying data reside in shared memory.
3. We probably want mutexes too.
4. Julia will need a package or something.

I bet piston is eating a ton of our stroke when running turbulence simulation, which is not very useful.

We should add an option to remove piston from the stream, or perhaps add a device that can remove piston from the global state.

Will fix soon. Just opening this to keep track of it.