[pom] Compute global properties.

Global properties such as the SARL specification version are computed by
Maven and defined a global property. They could be used for texte
replacement in the Maven modules.

Signed-off-by: Stéphane Galland <galland@arakhne.org>
[eclipse] Create a brandable product for SARL.

For setting the content of the about dialog box, the SARL product must
defined in a plugin. The product definition extension is added into the
Eclipse plugin, and the product definition in the update-site module is
updated accordingly.

see #248

Signed-off-by: Stéphane Galland <galland@arakhne.org>
[product] Add default SARL update URLs in the product.

Signed-off-by: Stéphane Galland <galland@arakhne.org>
[product] The Java perspective is the default perspective.

see #247

Signed-off-by: Stéphane Galland <galland@arakhne.org>
[eclipse] Fixing minor character encoding problems.

Signed-off-by: Stéphane Galland <galland@arakhne.org>