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.

test-date: check return value CID #1327432.

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

test: "today UTC" is not always "today UTC" On Oct 25 2015 in EET/EEST there is a UTC+3->UTC+2 transition. This means that the representation of "today UTC" as local time is ambiguous.

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: parse_timestamp UTC and fractional seconds tests

test-date: don't fail test if log_max_level is higher than LOG_INFO

time: support @ syntax for denoting times since the UNIX epoch 1970-1-1

time-util: teach parse_timestamp to parse weekdays

util: teach parse_timestamp() to parse results of format_timestamp_relative()

journalctl: implement --since= and --until for filtering by time