Ant build needs improvements #127

Hi,

I just saw that using Ant to build requires some improvements:

• Normally for a Java project all files found in the /lib folder (ie: jar archive) must be put in the Class-Path of the MANIFEST.MF file of the created jar archive. It seems that the model build.xml.tpl file does not support this.
• When exporting (ie: Export... -> LibreOffice -> Generate Ant script file) a jar archive of the project is generated and is found at the root of the project. This is not necessary and in any case this created archive is not usable and normally only the build.xml file should be generated at this time.

I will try to propose a PR.