Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`. Use `clang-format` version 6.0.
* 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.
Compute a default for `BUILD_CursesDialog` by building a small test
project that uses curses. Disable `ccmake` by default if it fails,
and do not search for Curses as part of the main build. This avoids
creating FindCurses cache entries when we are not considering ccmake.
If `BUILD_CursesDialog` is enabled (e.g. by the user) then warn if
curses cannot be found.
