tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.

util-lib: split out allocation calls into alloc-util.[ch]

util-lib: split our string related calls from util.[ch] into its own file string-util.[ch] There are more than enough calls doing string manipulations to deserve its own files, hence do something about it. This patch also sorts the #include blocks of all files that needed to be updated, according to the sorting suggestions from CODING_STYLE. Since pretty much every file needs our string manipulation functions this effectively means that most files have sorted #include blocks now. Also touches a few unrelated include files.

test-journal-flush: fix memleak

tests: use assert_se instead of assert Otherwise they can be optimized away with -DNDEBUG

journald: when we detect the journal file we are about to write to has been deleted, rotate https://bugzilla.redhat.com/show_bug.cgi?id=1171719

test-journal-flush: avoid predictable names in /var/tmp

journal: add a test case for flushing messages out of a series of journal files into a single new one