TODO

TODO: Need to double check spacing and drill values, before gerbers

TODO: review for noise
* Currently a 4 layer board to hopefully reduce amount of crosstalk where
  traces overlap or cross each other.
* while it may be as it is, it is not 100% symmetrical, and the traces
  in some quadrants overlap more than others, should this be improved?

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2mm part from here:

Mouser Part No: 517-950480-6102-AR
Manufacturer Part No: 950480-6102-AR
Manufacturer: 3M Electronic Solutions Division
Description: Headers & Wire Housings 80P BD MNT SKT 2R STRT PTH 10U AU
http://www.mouser.com/ds/2/1/TS2155-68321.pdf

also should check:
   http://www.hirose.co.jp/cataloge_hp/ed_A3_20130408.pdf

Compared against:

Mouser Part No: 517-929975-01-40-RK
Manufacturer Part No: 929975-01-40-RK
Manufacturer: 3M Electronic Solutions Division
Description: Headers & Wire Housings 40 CON STR BRDMNT SKT
http://www.mouser.com/ds/2/1/ts0815-31700.pdf