AddSourceFile

  IDA can keep information about source files used to create the program.
  Each source file is represented by a range of addresses.
  A source file may contains several address ranges.

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** Mark a range of address as belonging to a source file
   An address range may belong only to one source file.
   A source file may be represented by several address ranges.
        ea1     - linear address of start of the address range
        ea2     - linear address of end of the address range
        filename- name of source file.
   returns: 1-ok, 0-failed.

success AddSourceFile(long ea1,ulong ea2,string filename);