Add common map groupings as shortcut options to Web DAP GetMap drop-down

[bretthandrews]

Add common map groupings as shortcut options to Web DAP GetMap drop-down, such as: Stellar Kinematics: stellar velocity, stellar sigma, stellar h3, stellar h4 Emission Line Kinematics: Ha velocity, Ha sigma, [OIII] velocity, [OIII] sigma Emission Line Fluxes: [OII] flux, Hb flux, [OIII] flux, Ha flux, [NII] flux, [SII] flux Spectral Indices: D4000