lib/runscripts/subdir.run: subdir_make(): use new $datasrc_dir

lib/runscripts/subdir.run: added $datasrc_dir

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).

bugfix: lib/runscripts/datasrc_dir.run, subdir.run: need to remove leading . from dir name to get installed schema name, using new dir2schema()

lib/runscripts/datasrc_dir.run, subdir.run: use new lib/sh/datasrc.sh, which contains code in common to both datasrc-related dir runscripts

bugfix: lib/runscripts/subdir.run: subdir_make(): only remake if $remake has been explicitly propagated to subdir_make() by using self_make

*{.sh,run}: use simpler .rel() instead of `. "$(dirname "${BASH_SOURCE<sup>0</sup>}")"/...` for relative includes

lib/runscripts/subdir.run: auto-append -remake to all targets in remake mode

lib/runscripts/subdir.run: subdir_make(): put prepending of "$subdir/" on its own line for clarity

lib/runscripts/table_dir.run: renamed table to subdir because this can apply to any datasrc subdir. moved table-specific code to table.run.

lib/runscripts/table_dir.run: table_make(): moved $silent flag to lib/sh/make.sh make() so all make callers can use it

added lib/runscripts/table_dir.run and use it in table.run