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How to use scattnlay
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1. Compile Code:
   (a) Compilation options
	* make source - Create source package (python library)
	* make install - Install on local system (python library)
	* make buildrpm - Generate a rpm package (python library)
	* make builddeb - Generate a deb package (python library)
	* make standalone - Create a standalone program
	* make clean - Delete temporal files
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2. Use:
   (a) Python library
      * Use scattnlay directly
          from scattnlay import scattnlay
          ...
          x = ...
          m = ...
          terms, Qext, Qsca, Qabs, Qbk, Qpr, g, Albedo, S1, S2 = scattnlay(x, m)
          ...
      * Execute some of the test scripts (located in the folder 'tests/python')
          Example:  ./test01.py
   (b) Standalone program
      * Execute scattnlay directly
          Usage: scattnlay -l Layers x1 m1.r m1.i [x2 m2.r m2.i ...] [-c comment]
      * Execute some of the test scripts (located in the folder 'tests/shell')
          Example:  ./test01.sh > test01.csv
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