gw_summary: fixed GPS start/stop times

    - added support for channel sections including NDS type tags
data.py: don't query CIS for trends
plot: fixed T050017 compatibility
TriggerTabPlot: added start/end times and others

    - added automagical limit parsing from channel params
segments.py: allow 'validity' as DataQualityFlag
SummaryTab: get_ with state not state.active
bootstrap: added META and improved PATH parsing
SummaryTab: added meta and removed bogus HTML end tags