bugfix: lib/runscripts/util.run: gateway(): need to use is_callable() rather than func_exists() to check whether the target exists, because external commands (eg. echo) are supported as targets, too

lib/sh/util.sh: added is_callable()

lib/runscripts/util.run: support custom handlers for all targets (gateway()) as well as targets w/o function (fallback())

lib/runscripts/table.run: remake_VegBIEN_mappings(): renamed to just mappings() since action make targets should be short names

lib/sh/util.sh: stderr_matches(): inline the stderr_matches alias to avoid needing to quote stderr_matches as "stderr_matches" in the most common use case (with pattern as a prefix env var)

bugfix: lib/sh/util.sh: stderr_matches(): when passing `pattern=...` as a prefix env var, must be invoked as `"stderr_matches"` to avoid the env var applying to the prep_try portion of the stderr_matches alias

fix: lib/phpPgAdmin.login.php.diff: "For user public_, leave password blank" instruction: moved this to right under the Password field and increased the font size so people would be more likely to see it

lib/Firefox_bookmarks.reformat.csv: "page's description": changed to "page's own description" to clarify that this is a description provided by the page itself

bugfix: lib/common.Makefile: `svn add`: need to run with --force because the new version of svn in the latest Mac upgrade errors if the file is already under version control

validation/aggregating/*/*.sql, schemas/vegbien.sql, lib/runscripts/validations.pg.sql.run, inputs/bien2_traits/validations.sql: added _ to beginning of each view name so the validation views would sort at the top in the datasource's tables list. this will also make the validation result sets easily distinguishable from the data tables.