Renamed LambdaSex and fiSex to LambdaDeg and fiDeg

This is most coherent because we accept / return decimal and sexagesimal
degree (and, also, both were always internally converted to decimal
degree for the calculations.
Accept more input degree variants...

...and also add new two output ones:

  utm2geo_SW() which appends 'S' and/or 'W' to degree when needed.
  utm2geo_NS() which ALSO appends 'N' and 'E' when needed.

Also, both add «º», «'» and «"» to degre, minutes and seconds,
respectively.

All implemented in both javscript and PHP versions but yet only tested
in javascript.