share/exporters.xml: encode strings in metadataplayer export view
util.slicebuffer: use autovideosrc
util.importer: use utf-8 as default encoding
util.importer: fix "both" mode in textual import
util.importer: improve command line handling

It is not possible to invoke the util.importer module as a front-end
script for import filters.
util.importer: dump package to stdout if no output file name is specified
util.importer: add spaces
core.controller: rename variable
util.importer: load plugins
util.importer: fix reference to IMPORTER list
util.importer: fix display
CHANGES.txt: document changes
Merge branch 'master' of github.com:oaubert/advene
Update translations

Thanks to Emmanuel Ayala Mexicano <amarrextro@yahoo.com> for the spanish translation