Update tclap version to 1.22 & add UpdateFromUpstream.sh script

[jcfr]

See also https://github.com/Slicer/tclap/

[hjmjohnson]

#120 is rebased code on the upstream version of tclap. This restores tabs and end of line spaces so that diffs are minimized bertween upstream and the current code base.

[hjmjohnson]

The first part of this request has been completed in #120.

A patch was also provided upstream to provide an upstream fix to remove end of line spaces.

The https://github.com/Slicer/tclap/ is updated to contain branches that contain the cherry-picked versions of code changes from the original SlicerExecutionModel/tclap subdirectory.