o add 'install' target
o shorten the name of INCLUDE_PATHS to IMPORTS
o use filename prerequisities and targets rather than phony keywords
o add a dependency on .git/refs/tags for the githash target
o add githash.txt and dfmt-test to the clean target
o add more targets to .PHONY
Now when an error in formatting happens, it never outputs anything and
doesn't override the file when working inplace.
Additionally dfmt is no longer able to fail in the middle of a file, as
now we first write everything to a buffer and only if everything was
successful, that buffer is printed to stdout or written to the inplace
file.
This should also guard against segfaults with inplace file formatting
erasing parts of the file, as well as the user thinking it was
successful, even though dfmt didn't finish properly.
Jeremy Baxter
WebFreak001
Sebastian Wilzbach
BBasile
Stefan Koch
Hackerpilot
Andreas Zwinkau