Add references to MCNP user manual and documentation updates

[MicahGale]

Description

This is currently a draft playbox right now.

This won't address #413, but put the machinery in place for it. This is also related to #414, but won't close it.

Fixes #412, fixes #416.

Checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works (if applicable)

[coveralls]

Pull Request Test Coverage Report for Build 9587963337

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.223%

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Totals
Change from base Build 9550865708:	0.0%
Covered Lines:	5750
Relevant Lines:	5854

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9617441527

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.223%

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Totals
Change from base Build 9550865708:	0.0%
Covered Lines:	5750
Relevant Lines:	5854

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💛 - Coveralls

[tjlaboss]

Another issue I found. I think they used \LaTeX and so there's a difference between section and subsection (and probably subsubsection). See https://mcnp.lanl.gov/pdf_files/TechReport_2022_LANL_LA-UR-22-30006Rev.1_KuleszaAdamsEtAl.pdf#section5.2

The MCNP6.3 manual uses

• part
  • chapter
    • section
      • subsection

and a few special cases. So, we should add a general case, and possibly "part" and "chapter" as well.

[MicahGale]

I think subsection will be the most commonly used so I think that should get :manual63:, then we could do :manual63sect: ... part: ... chap:.

[MicahGale]

Also I looked into the UTF-8 decode error, and it makes no sense, so yay.

[coveralls]

Pull Request Test Coverage Report for Build 9622416857

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Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.223%

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Totals
Change from base Build 9550865708:	0.0%
Covered Lines:	5750
Relevant Lines:	5854

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9622432207

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.223%

---

Totals
Change from base Build 9622313437:	0.0%
Covered Lines:	5750
Relevant Lines:	5854

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9648770880

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.223%

---

Totals
Change from base Build 9622313437:	0.0%
Covered Lines:	5750
Relevant Lines:	5854

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9649231254

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.223%

---

Totals
Change from base Build 9622313437:	0.0%
Covered Lines:	5750
Relevant Lines:	5854

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9649924910

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.223%

---

Totals
Change from base Build 9622313437:	0.0%
Covered Lines:	5750
Relevant Lines:	5854

---

💛 - Coveralls