updated that stupid ball
Merge branch 'master' of https://github.com/mylonasc/compelectromag

Conflicts:
	testing/ball_stupid.edp
added clean ball code
improved borders
small fix in E field
continued formula
int1d -> int2d for forces
updated balls
more experiments on ball, added simple product rule check
asdf
Added presentation template
Added charge solution (poisson)
asdf
Merge branch 'master' of github.com:donjan/compelectromag

Conflicts:
	code/ball_naive.edp
	testing/product_rule.edp