Get input output list with symlinks

[ywmei-brt1]

Add a function, GetIO, to return list of inputs and outputs.

Note that symlinks with new name: my_sym_link (path), point to a old name: my_origional_file (target) will be represent as a string my_sym_link->my_origional_file (from path to target)

[ywmei-brt1]

Will separate the input field and output field into

• input/output files,
• input/output files symlinks,
• input/output directories
• input/output directories symlinks

[ywmei-brt1]

Inputs are separated as 1) Paths, the 2) Symlinks, as there is no such thing as input directories; Outputs are separated as 1) File 2) Dir, 3) File Symlinks, 4) Dir Symlinks.