Add pdsp to documentation

[FanwangM]

This PR does a few things for documentation,

• Fix header level for accessing translation and scaling information
• Add and fix documentation for psdp module

[FanwangM]

Can you confirm that 6112464 is doing the right fix? The original documentation has a problem of equation rendering. Thank you.
@banrovegrie

[codecov]

Codecov Report

Merging #186 (6112464) into master (48edbdc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #186   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files          11       11           
  Lines         671      671           
=======================================
  Hits          634      634           
  Misses         37       37           

Impacted Files	Coverage Δ
procrustes/psdp.py	96.96% <ø> (ø)

[banrovegrie]

@FanwangM yeah it solves the rendering issue.

[banrovegrie]

Btw, what is this coverage report?

[banrovegrie]

@FanwangM lets keep this PR open for the documentation errors we might encounter while implementing the last algorithm as well. I guess we can keep rebasing this commits over the PRs that we merge.

[FanwangM]

Btw, what is this coverage report?

CodeCov provides a nice way of visualizing the testing coverage of the pull request and more details can be found at https://about.codecov.io/.

[FanwangM]

@FanwangM lets keep this PR open for the documentation errors we might encounter while implementing the last algorithm as well. I guess we can keep rebasing this commits over the PRs that we merge.

Yeah, we can wait for a while.