Project cleanups

Hi,

while working on the Debian package of graphtea, I've made some modifications to your code.

To the best of my knowledge, none of these changes would break your current workflow, so it's probably safe to merge them to master.

Since I'm lacking Java skills (first time ever today), I suggest you review the changes. In essence, I've moved src/scripts/build.xml to the toplevel directory, did some cleanups (see the corresponding commit message) and changed the Java code so that it is no longer necessary to cd into binary/ before running (needed for Debian, since files will go to /usr/share/graphtea).


Cheers