Revert "README updated"

This reverts commit 36c69193578ade0df5ffef01a84a43fda1d2e749.
Revert "Revert workaround for CTK external library dirs"

This reverts commit 0d653d2c0ba97ca142be15287ffe64df6d5beea4.
Merge branch 'bug-16265-trac-2333-2747-revert-workaround-for-ctk-external-library-dirs' into niftk