Pin down test stochasticity

[arnavs]

• [x] optgrowth (0.025086037159168094 => 0.02508603753450376)
• [x] rational_expectations (we accidentally used values of a variable from a later cell in our unit tests)
• [x] linear_models (these tests run on my local machine sans modifications)
• [x] amss (these tests run on my local machine sans modifications)
• [x] opt_tax_recur (these tests run on my local machine sans modifications)
• [x] data_statistical_packages (Vegalite => VegaLite)
• [x] lake_model (these tests run on my local machine sans modifications)
• [x] career (these tests run on my local machine sans modifications)
• [x] egm_policy_iter (error test: 4e-16 => 1e-15)
• [x] markov_asset (these tests run on my local machine sans modifications)

[arnavs]

• [ ] For tests that pass without modification, double check random seeding and equality on floating points (shouldn't use it).

• [x] Double check that the build server is on 1.0.2

[arnavs]

Changing the priority on this now that we've established the correctness of the code.

[arnavs]

Was a tolerance issue. Resolved now on the lectures.quantecon.org/status.html