notebook update so that when they type new variables, they only have to run one cell
notebook update so that when they type new variables, they only have to run one cell

ubcgif/gpgTutorials,geoscixyz/gpgLabs,sgkang/GeophysicsToy,ubcgif/gpgLabs,ubcgif/gpgLabs,kinverarity1/gpgLabs,geoscixyz/gpgLabs