*{.sh,run}: use new begin_target instead of `echo_func; set_make_vars`
moved everything into /trunk/ to create the standard svn layout, for use with tools that require this (eg. git-svn). IMPORTANT: do NOT do an `svn up`. instead, re-use your working copy's existing files with `svn switch` (http://svnbook.red-bean.com/en/1.6/svn.ref.svn.c.switch.html).
lib/runscripts/extract.run: added export_sample()
lib/runscripts/extract.run: use the extract-specific view instead of all of analytical_stem
added lib/runscripts/import_subset.run, extract.run