* startup.el: Streamline code in several functions and use a more
consistent idiom within the file, for ease of reading and maintenance. Rephrase booleans to avoid `(not noninteractive)'. Clarify several booleans expressions using De Morgan's laws. (command-line): Fix barf when first command-line option handled by `command-line-1' is in the form --OPT=VAL. (command-line-1): Restore intended behavior of the --directory/-L command-line option: "-L a -L b -L c" on the command-line now puts '(a b c) at the front of `load-path'.
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