nano: upgrade 7.1 -> 7.2

Changelog:
============
  bindings: let ^/ toggle between the 'search' and 'gotoline' menus
  bump version numbers and add a news item for the 7.2 release
  copyright: update the years for the FSF
  docs: give ^K and ^U some useful function in the alternative bindings
  docs: put the binding of ^Y after its unbinding, for it to be effective
  gnulib: update to its current upstream state
  input: disallow bracketed pastes when in view mode
  syntax: html: colorize specially the other two emphasizing tags too
  tweaks: avoid warnings when compiling with -Wpedantic
  tweaks: rewrap an old news item
  tweaks: separate a special thanks from the preceding ones

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

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