SAN FRANCISCO (Reuters) - Aid groups asked companies to donate cash to help earthquake relief efforts in Haiti instead of supplies like clothing and tents that they cannot distribute yet because of the devastation. World Relief groups are trying to address immediate needs such as clean water and medical supplies, and also are trying to keep airspace around Haiti clear for those needs. Planes full of supplies headed to the Port-au-Prince airport on Thursday, but they arrived faster than ground crews could unload them. Aviation authorities had to restrict non-military flights from U.S. airspace because they feared the planes would...