reorganized start-processing.sh for better readability
minor typo
I was having some problems with empty scans (e.g. issue #16; FIANJ station). I fixed it by skipping such scans, but my fix has implications for other functions, e.g. 'make_cluttermap.pro'. In any case, the vast majority of stations does not have empty/0-range scans
This update was necessary because some stations, e.g. FIANJ, have empty/zero-range scans, and that broke 'statistics.pro'. Here, I changed the way 'make_cluttermap.pro' iterates over the scans: previously, it simply extracted the datasets from a list of the tags in the structure 'in', and iterated over those. Now, I'm iterating over all tags, and if a tag starts with the letters 'dataset' followed by a number, then I know that tag represents a scan, and that the number is the scan number.
added testdata/stations.txt and data/stations.txt to .gitignore
data/stations.txt and testdata/stations.txt are no longer being versioned
removed the 11th file from CZ_ska (only need 10)
minor change: deleted commented-out code