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

bugfix: schemas/vegbien.sql: taxondetermination_set_iscurrent(): is_datasource_current (used by analytical_stem_view): need to separately check if `determinationtype IS NULL`, because `determinationtype NOT IN (accepted, matched))` will return NULL (false) if determinationtype is NULL, causing no match

bugfix: bin/make_analytical_db: when running into a public schema other than "public", also pass this to `/run export_` (which currently uses $schema instead of $public)

bugfix: bin/import_all: fix $ when .-included without args (which causes bash to put the wrong values in $ instead of leaving it empty)

bin/import_all: `make schemas/$version/install`: reinstall instead to allow re-running the import to the same custom schema (e.g. 2013-10-18.Brian_Enquist.Canadensys)

bin/import_all: `make schemas/$version/install`: ignore errors if schema exists, to support running with -e

bugfix: bin/import_all: removing inputs/.TNRS/tnrs/tnrs.make.lock: use `"rm" -f` instead of plain "rm" to avoid having an error exit status, which will abort the script if run with the -e flag (as runscripts are)

lib/runscripts/util.run: run script template: changed sample command name to all() because each runscript requires this in order to be run without args

lib/runscripts/util.run: support scripts that are run as shell-includes (with leading "."), by allowing the calling script to manually invoke on_exit() without it then being invoked twice (the end of a shell-include does not trigger the EXIT trap)

bin/*_all: *_main(): renamed to just main() because it does not matter that other shell-includes' main() methods will clobber this, because it is only executed once