Log Message:
tex-hyperref{,-doc}: update to 6.88h

Update to hyperref fixing issues reported on GitHub,
 main log entries since last release:

  copy manifest to tds zip for ctan checks
  spurious dictionary file for an unknown spell checker
  additional html files from restructured manual
  updated version and changelog
  added aftergroup code
  remade luatex test-files
  adapt version number
  removed producer from dviwindo
  removed producer from dvipsone driver
  removed producer code from xetex/dvipdfm driver
  removed producer code from pdftex driver
  remove pdfproducer setting from luatex driver
  added \mu mapping to psdextra.def
  limiitiiationss
  README is now merged with the manual, apart from a basic stub
  testfile for issue 81
  gobble \thanks in pdftitle
  Dutch language \autoref support