[Insight-developers] Finding include and lib directories

[Paul Hughett]

I have now modified most of the CMakeLists.txt files to define the
necessary directories to search for missing include and lib files, at
least on the gcc/linux platform.  The Testing/Code/Algorithms,
Code/Algorithms, and Examples directories remain to be done, and
appear to have worse problems than just missing include and lib files.
I make no guarantees that these changes will not break other platforms.

Paul Hughett