[gdal-dev] Mass-conversion from NULL to nullptr ready to land

[Even Rouault]

> As this is a rather painful exercice (1146 files changed) which is very
> fragile to concurrent changes, I'd like to drop this in trunk ASAP if
> there's no opposition.
> 

I've just committed the changes (with more triggered by clang 5.0, which
catches more things)

Thanks Mateusz for the pointer to https://github.com/rizsotto/Bear . From a
quick try, this works. However, in case others want to make a try with it,
I got crashes of clang-tidy from Ubuntu 16.04 when making it work on the
json compile database, whereas in manual mode it worked. I solved that
by using binaries of clang 5.0 instead.

Recipee:
(clean or touch files you want to edit with clang-tidy)
bear make
clang-tidy -checks='-*,modernize-use-nullptr' -p=compile_commands.json -fix port/cpl_string.cpp

Even

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