GWSummConfigParser: improve error handling
triggers.py: add option for multiprocessing

    - at this time the option doesn't do anything
builtin_plots: fix xlim on some plots
Tabs: allow conditional processing of parts

    - separated tab #main content into one file per state to support
      conditional re-writing of inner or outer content only
    - added --no-html option to not write supporting HTML, only the tab
      frames themselves
    - added --html-only as the inverse of --no-html
    - a few minor bug fixes got squashed in as well
data.py: added hacks for L1_C/L1_R data type renaming
data.py: enabled and modified resampling

    - ODC state-vector channels are handled in a special manner, by
      sample selection, rather than filtering
    - this only works if the user tries a sensible integer-value
      decimation