Santec wavelength table sometimes fails.

[ichristen]

Setup
OS: Windows 10 Home
Python: 3.8.8
Conda: 4.10.3

(Have also seen this sometimes on other computers with python ~ 3.9, 3.10, windows 10, 11)

Issue
Sometimes, the Santec wavelength table does not set to the correct value. See that the wavelength remains the old value and the phase is oddly at 0pi. Sometimes, the wavelength becomes 0 nm.

Proposed Resolution

• Debug to see if we're using pointers incorrectly or something, or need to pause or something.
• If the error is stochastic, add error checking to keep attempting to set the correct value until it's right.

[ichristen]

Fixed in #13. Now attempts multiple times and has better error-checking.