lib/sh/db.sh: mysql_import(): in append mode, use LOAD DATA IGNORE to allow inserting duplicate rows

inputs/GBIF/raw_occurrence_record/run: herbaria_filter/make(): if remaking, turn off remake mode after doing this target's rm operations, so that prerequisite targets are not also remade

lib/sh/util.sh: to_file(): removed no longer needed separate logging of >$stdout, which is now done by command()

lib/sh/util.sh: echo_redirs_cmd(): use $ in a subshell instead of manipulating the @redirs array directly, because operations on $ (e.g. $#, $1, shift) are much simpler than the corresponding array operations ( ${#redirs[]}, ${redirs[0]}, redirs=("${redirs[]:1}") )

lib/sh/util.sh: echo_redirs_cmd(): log each file redir with a separate log() statement, so each line is indented

lib/sh/util.sh: added echo_redirs_cmd and use it in command() to print cmd

lib/sh/util.sh: command(): print <>file redirects before command, because they introduce it

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

lib/sh/util.sh: to_file(): use @redirs to echo and set >$stdout instead of setting it manually, which is possible now that the command() @redirs bug has been fixed

bugfix: lib/sh/util.sh: convention of fds to use for command-specific alternate stdin/stdout/stderr: changed to 40/41/42 because 10/11/12 are used by eval (which is used by set_fds()). use of fd 10/11/12 will cause hard-to-find silent bugs because exec will not print an error when these are used. documented why not to use other series of fds for this purpose:...