Merge pull request #29 from HerrMuellerluedenscheid/uplink

chopper_selected_traces: fixed typo
snuffling: added some new methods

  get_markers
  get_event_markers
  get_selected_markers
  get_active_event_and_phase_markers
  pile_changed
  enable_pile_changed_notifications
  disable_pile_changed_notifications
fix for previous commit
seismosizer: added CLVD source type
Merge pull request #30 from HerrMuellerluedenscheid/uplink

Added documentation in snuffling.py
snuffling: fixed some typos and improved some docstrings
improved a doctstring
Merge branch 'uplink' of https://github.com/HerrMuellerluedenscheid/pyrocko
snuffling: marker classes and functions now in snuffling namespace
included gmtpy
added topo stuff
added automap module
added automap app
gmtpy: pycdf -> scipy.io.netcdf
added geonames module
improved automap command line frontend
some tweaks to automap
autmap: added --download-etopo1 and --download-srtmgl3 options
automap: added --make-decimated-topo option
snuffling: keep currently selected value when choice entries are modified