Merge pull request #63 from rudigens/master

Pull latest changes
Merge pull request #67 from rudigens/master

Pull latest changes
Temporary check in.
Crossing dateline function.
New asf_subset tool. Preliminary check in.
Sorted through the dateline issues in generating the subset. About ready to go.
Forgot to update some build information.
Needed to sort through some Poly definition issue.
Had to change the sequence for a successful build with make.
Needed to make a few changes to the metadata for subsetting SMAP data. Excluded the lat/lon layers from being clipped to the polygon, since I need those layers complete to ensure that the geocoding is actually working.
Major overhaul of convert2vector functionality.
Forgot the vector functions.
Forgot the help functions as well.
Final part of refactoring the convert2vector code.
Forgot some build details.
Few minor changes to get Radarsat2 data to work. More clean up.
Sorted out some projection information.
Merge pull request #68 from asfadmin/devel

Pull latest changes
Removed any subset prototype code out of the ingest. Subsetting is now done with a separate tool (asf_subset).
Usage for smap2browse needed an update.