Release of XStudio 1.0b1

The version 1.0b1 of XStudio has been released and is available for download at the usual location: http://www.xqual.com/support/download.html.

Main changes from 1.0a4 are:

* Several minor bug-fixes
* History buttons previous/next (browser-like)
* Attachments on requirements and specifications
* Attachments inheritance on req, spec and tests
* Charset for country_id in table_absence
* Updated User's Guide