Run the `Utilities/Scripts/clang-format.bash` script to update
all our C++ code to a new style defined by `.clang-format`.
Use `clang-format` version 3.8.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
- Add TIFF::TIFF imported target
- Document imported target
- Add testcase to test the standard variables and the imported
target
Also:
- Add TIFF_INCLUDE_DIRS to match common practice
- Update documentation generally, including documenting
TIFF_INCLUDE_DIRS
