- update_global_rank new function : far more intelligent update. Take into

  account the possiblity to have category tree not in category id ascending
  order

- update global_rank when moving categories among the same parent

- new function mass_updates : depending on MySQL version, create a temporary
  table, make one big insert and one big update by joining 2 tables (4.0.4
  or above) or make 1 update per primary key

- function update_category improved for representative_picture_id check :
  only one useful query (equivalent to NOT EXISTS) instead of N (N = number
  of categories) queries


git-svn-id: http://piwigo.org/svn/trunk@625 68402e56-0260-453c-a942-63ccdbb3a9ee

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