src/afuse.c: remove indentation info
ChangeLog -> NEWS: renaming, consistent formatting

Renaming follows the libabc "guidelines":
https://git.kernel.org/?p=linux/kernel/git/kay/libabc.git;a=blob;f=README;h=b4bed;hb=HEAD#l193
README: remove maintainer information, change URI
HACKING: refer to github, specify indentation, fix typos
NEWS, README, configure.ac: get ready for a 0.4 release

As discussed with cjiph, 0.2 and 0.3 have been mixed in the past.
Moving to 0.4 to avoid any confusion.