plot: added new instance attribute and href
SegmentSummaryPlot: fix quotes in labels
get_segments: added return_=True kwarg

    - skips compound segment generation if only loading for later use
use plot.now to find/process tab data
gw_summary: use FFT-plan level 2 for day
gw_summary: bulk load segments

    - load 'All' data and all-states = True data