BibFormat: Disable escaping in abstract

* Disabled escaping in abstract in Default_HTML_detailed.bft.
BibFormat: Equations in title and keywords

* Removes escaping from title and keywords formating elements in
  order to print equations.
MiscUtil: Render MathML by MathJax

* Adds config variable CFG_MATHJAX_RENDERS_MATHML to enable or disable
  usage of MathML in Invenio.
* Changes function responsible for loading MathJax to load
  different configuration version according to CFG_MATHJAX_RENDERS_MATHML.

Reviewed-by: Samuele Kaplun <samuele.kaplun@cern.ch>
SCOAP3: Global variable for Elsevier packages.

* Adds global variable with path to directory to store packages
  harvested from Elsevier.
SCOAP3: Adding a new folder to invenio-autotools.conf

* Adds a folder for harvesting Springer repository.
SCOAP3: BibFormat changes for MathML rendering.

* Changes format templates to not escape title and keywords.
* Changes tite_brief format to support not escaping.
BatchUploader: authorize via CIDR

* Extends IP-based authorization by supporting
  network ranges (i.e. CIDR) as well.
BatchUploader: insert or replace mode

* Allows to specify the "/insertorreplace" mode
  on the restupload interface, which will map
  to bibupload --insert --replace command line.
BibUpload: new CFG_BIBUPLOAD_MATCH_DELETED_RECORDS

* Introduces new flag CFG_BIBUPLOAD_MATCH_DELETED_RECORDS
  to allow for site-wide configuration policy whether
  to match against deleted records or not, upon
  bibuploading.
  (closes #1438)
BatchUploader: apache error codes

* Correctly sets Apache error codes when replying
  to client requests in robotupload.
WebSearch: 1st time webcoll

* Allow to run webcoll the 1st time (when there
  are no collections).