API: copy Index when creating in a Series to avoid aliasing
TST: fix failing unicode comparison test on sparc (with non-standard encoding)
Merge pull request #5043 from jreback/sparc_fix2

TST: sparc test fixups
CLN/TST: Mark areas that need to be improved throughout.

* Add TODOs to places that are clearly not tested (b/c they had undefined names) and fix the undefined names
* Add TODOs to unused names.