[clam-devel] guiless lv2 working again

[David García Garzón]

I just sanitized the clam_lv2_generator script so that it is more ready for 
the general public. The main problem was that the WIP gui feature was in the 
middle of the previously working guiless behaviour, so i did the following 
changes:
- the gui is just enabled if we provide the --gui-binary option
- the --binary option is now forced (clam_lv2_example by default was nonsense)
- the --uribase is now clam examples uri (maybe forcing also is better)
- I splitted the tests in a different file, moved the input file into 
b2b/lv2plugin/inputs, and added a new test on the gui option
- the clam_lv2_generator script in scons is taken from clam_prefix/bin and 
with no .py extension as it is installed now, and scons commands use it by 
means of $CLAMLV2
- the other scons vars have CLAMLV2_ as prefix
- scons Commands are smarter now, add doap file or gui binary just if the 
corresponding vars are defined

David.