standarize REMARKs

[sbenthall]

• [x] https://github.com/econ-ark/BlanchardPA2019 : needs reproduce.sh and pinned dependencies
• [x] https://github.com/econ-ark/CGMPortfolio needs pinned dependencies
• [x] https://github.com/econ-ark/KrusellSmith needs pinned econ-ark dependency
• [x] https://github.com/econ-ark/PortfolioChoiceBlogPost needs reproduce.sh and dependencies
• [x] https://github.com/econ-ark/EndogenousRetirement needs reproduce.sh and requirements file
• [x] https://github.com/econ-ark/BayerLuetticke : needs reproduce.sh and pinned dependencies, with binder folder

llorracc repositories

• [ ] https://github.com/econ-ark/BufferStockTheory linked repository is default to gh-pages branch, derived from llorrac repo version.
• [ ] BLOCK https://github.com/llorracc/cstwMPC pin econ-ark, needs reproduce.sh (no merge rights)
• [ ] ERROR https://github.com/llorracc/ctDiscrete needs reproduce.sh and requirements file
• [ ] ERROR https://github.com/llorracc/cAndCwithStickyE needs reproduce.sh

Lower priority:

• [ ] ERROR https://github.com/econ-ark/cstwMPC-RHetero pin econ-ark, pin econ-ark dependency

[sbenthall]

related to #88

[sbenthall]

I will continue to do this review in light of the new requirements.

[sbenthall]

All of the checked REMARKs have requirements.txt and reproduce.sh.

The remaining REMARKs have some kind of error or blocking issue.

[sbenthall]

The erroring REMARKs will be dealt with separately.

Finalizing the viable remarks now covered in issue #98