Layouts contain quite heavy xml code, and there are many layouts available for navit.
They are all inserted inside the main navit.xml, which makes it hard to edit because of its size, even if changes or customizations by users are very rarely on the layout code.
I have thus moved the layout code away from navit.xml, each layout having its own xml definition file, called navit_layout_*.xml
These files are inserted inside the main navit.xml file by using the already existing xi:include mechanism, this also allow for backwards compatibility (old monolithic navit.xml files are still valid and can be used).
The other advantage for this is that f the user wants to have his/her own customized navit.xml, he/she can still include the shipped layout files, making their xml lighter. This also allow to enable/disable specific layouts easily by including or not each layout file.
It is also easier to perform side-by-side comparison between two layout files.

* Fixing WinCE build script

Remove inclusion of sample map in zip package (which, in addition, fails currently because map server is down)
Allow running script twice by performing cleanup on directories if already created
Adding missing espeak-data to zip package (currently missing and makes navit speech synthesis fail on current WinCE builds)

* Adding xslt processor to build env

* Pre-filling <vehicle> tag for WinCE