Merge bug branches into upstream

 'bug/allocate-64-instead-34-for-path'
 'bug/do-not-delete-temp-files-in-adjunct-mode'
 'bug/fix-ifndef-hidding-needed-values'
 'bug/fix-typo-in-button_press-release'
 'bug/link-against-libgif-instead-of-ungif'
 'bug/make-drifnet-read-from-pcap-file'
 'bug/memstr-64-bit-spin'
 'bug/prevent-backtrace-due-to-unneccessary-xfree'
Merge branch 'bug/no-makedepend' into upstream

Conflicts:
	img.h
Merge branch 'bug/use-pkgconfig-for-libpng' into upstream

Conflicts:
	Makefile
Merge feature branches into upstream

 'feature/deal-better-with-libpng-errors'
 'feature/make-mkdtemp-more-portable'
 'feature/refactor-filename-check-code'
 'feature/update-man-file' into upstream
Imported Upstream version 1.0
Merge branch 'upstream' into debian

Conflicts:
	Makefile
	src/display/img.h
New debian release 1.0