Select Observations remove blank lines, Select Observations add Recent option

Select Observations Page:     Remove blank lines
     Drop blank lines for Locations W/O Observations
ObservationsIndexViewController Class:
1/ initWithStyle method
    Filter out Locations W/O Observations

Select Location Page:    Add Recent Option.
      Displays the most recently used 20 locations.
StationsIndexViewController Class:
1/ Add Recent Bar Button
2/ Add doRecent method toggles between
      All and Recent Stations arrays
3/ Add getRecentStations
     Gets LRU Station names
     Builds Recent Station arrays
4/ Mod didSelectRow method
    Add Save Station Name.
5/ Mod doFind method
    Add select All Stations
NBSettings Class:
1/ Add recentNames list
2/ Add get names method
3/ Add addName method

View and Edit Observations:  Ensure Edits are saved
1/ Modify Back button
2/ Add onBack method
     If in Edit mode do FSStore saveChanges
3/ Mod onEdit method
    If in Edit mode set Back button title to Save