Correct typo in partial pressure abbreviations

Partial pressures abbreviations should have capitalized chemical element
symbols  e.g. pn2 -> pN2

Signed-off-by: Giuseppe 'ferdy' Miceli <ferdy@ferdy.it>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Correct another typo

Non-stop Dive Limit (or No Deco Limit) abbreviation is not NTL but NDL

Signed-off-by: Giuseppe 'ferdy' Miceli <ferdy@ferdy.it>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Fix gps parsing

The argument index used to pull in the translated hemisphere letters was
incorrect.

Fixes #418

Signed-off-by: Gopichand Paturi <gopichandpaturi@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>