Install instructions don't work for Noetic

Even after getting this working on porcine, I'm not sure how it's intended to work. I think the README and Makefile for install are meant for the other build system, and don't actually work nicely with catkin.

What I did:

• catkin build dalsa_gige_grant
• manually copy dalsa_gige_grant to /usr/local/bin
• manually run chmod +s
• comment out the install line in Makefile's install target, replace melodic with noetic, then run sudo make install. I assume that this is required so that the libraries installed by ROS are on the path when starting something with dalsa_gige_grant (when I hadn't done this, I got errors about missing libbondcpp.so and libclass_loader.so which are core parts of ROS.)