OAIRepository: forcing clients to re-harvest

* Introduces a new OAI Set operation called "touch", available from the
  administrative web interface, that allows admins to force clients
  re-harvesting a particular OAI set. This is useful in case e.g.
  the format use to convert to e.g. OAI_DC has been enriched.
  (closes #1218)

Reported-by: Martin Lessmeister <mhl10@cornell.edu>
Tested-by: Tibor Simko <tibor.simko@cern.ch>
I18N: updates to Catalan and Spanish translations

* Merge note: amended Python format in one phrase to pass validation.

Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
WebSearch: Search Guide reformat and pretty-print

* Indents and reformats the guide using Emacs HTML mode
  indent-for-tab-command and fill-paragraph commands.
  There has been absolutely no content change in this patch.
  There are a few mismatch tags and a couple of unescaped
  greater-than characters.  They will be fixed in the next patch,
  because otherwise it is too difficult to isolate the changes.
WebSearch: fix Search Guide mismatch tags

* Second round of fixes: adds missing tags, replaces tabs with spaces
  and reformats document.
WebSearch: fix Search Guide reformatting

* Moves paragraphs around so the two lists of the section
  ``How to search for publications by a given author''
  become a single list again.  This error was introduced
  in the previous commit.  The reason was that this
  (quite long) section was split in two between the original
  English and French versions, so in the middle of the English
  text, without closing the <ol>, started the French version,
  and after this translation, the English text continued,
  followed by the French translation.  The all English text
  is now joined together, in a single <ol> list, and the same
  is done with the other existing translations.

Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
Merge branch 'maint-1.1'

* maint-1.1:
  I18N: updates to Catalan and Spanish translations

* Merge note: the PO files were msgmerged from maint-1.1.

Conflicts:
	po/ca.po
	po/es.po
Merge branch 'master' into next

* master:
  WebSearch: fix Search Guide reformatting
  WebSearch: fix Search Guide mismatch tags
  WebSearch: Search Guide reformat and pretty-print
  I18N: updates to Catalan and Spanish translations
  OAIRepository: forcing clients to re-harvest

* Merge note: amended OaiREPOSITORY SQLAlchemy model
  according to `invenio_2013_02_01_oaiREPOSITORY_last_updated`.