nano: upgrade 6.3 -> 6.4

Changelog:
==========
  bump version numbers and add a news item for the 6.4 release
  display: remember text and column positions when softwrapping a line
  docs: concisely describe how the linter behaves
  docs: remove the two notices about the changed defaults
  docs: rename README.GIT to README.hacking, so it's clearer what is meant
  docs: stop mentioning the obsoleted keywords that were removed
  files: designate the root directory with a simple "/", not with "//"
  formatter: instead of leaving curses, use full_refresh() to wipe messages
  gnulib: update to its current upstream state
  help: reshuffle two shortcuts so that more help-line items are paired
  options: stop accepting -z, as --suspendable has been dropped too
  rcfile: remove five obsolete or deprecated keywords
  syntax: default: do not colorize a square or angle bracket after a URL
  syntax: perl: add missing keywords, and reduce the length of some lines
  syntax: python: mention an alternative linter in a comment
  tweaks: add a missing word to a news item
  tweaks: add a translator hint
  tweaks: improve a comment, and reshuffle two functions plus some lines
  tweaks: put each regex on separate line, to better show many keywords
  tweaks: rename a variable, to not be the same as a function name
  tweaks: rename two variables, to not contain the name of another
  tweaks: reshuffle a description and rewrap another
  tweaks: reshuffle a few lines, to group things better
  version: condense the copyright message, to not dominate the output

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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