bugfix, fencegui matching simplification

radblockproc - added optional amplitude normalization
pickgui - attempted updated parallelization, squashed various small
bugs/ambiguities, prepared for ability to edit bed/surface (not there
yet)
mergegui - attempted updated parallelization, improved various
elev/depth/flat interactions
fencegui - removed master id assignment in matching/saving (now done
better elsewhere)