*{.sh,run}: runscript targets: use begin_target instead of echo_func so the target name is properly echoed. note that this requires using with_rm so that $rm is properly progagated to applicable invoked targets. (previously, $rm was progagated to all invoked targets. note that with_rm only works inside a runscript target that starts with begin_target.)

fix: schemas/VegCore/mk_derived: added `EOF` at end to avoid (benign) "here-document delimited by end-of-file" warnings on Linux

*{.sh,run}: use new begin_target instead of `echo_func; set_make_vars`

added schemas/VegCore/Brad_Boyle/bien3_data_provenance_use_cases.docx* from e-mail from Brad

schemas/VegCore/vegbien_identifier_examples.xlsx: changed to symlink to Brad_Boyle/vegbien_identifier_examples.xlsx, to avoid duplicate copies

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).

schemas/VegCore/ERD/VegCore.ERD.mwb: traceable.id_by_source: support multiple ids_by_source per traceable, because the same entity may be present in multiple datasources (e.g. if one got data from the other), and we would like to remove that duplicate

schemas/VegCore/ERD/VegCore.ERD.mwb: connecting lines: inherits from traceable: added arrow to indicate what this label refers to

schemas/VegCore/ERD/VegCore.ERD.mwb: regenerated exports and udpated image map

schemas/VegCore/ERD/VegCore.ERD.mwb: HAS-A/IS-A box: renamed to "connecting lines" for clarity