ALICE: update of `alice-analysis-modules.xml`

* Fixes HTML/XML formatting in the description field.
  (addresses #405) (PR #708)
templates: safe display of markup in `abstract`

* Considers `abstract` as `safe` for showing HTML content it
  contains.  (closes #405) (see PR #708)

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>