bugfix: lib/runscripts/import.run: all(): also need to propagate $rm to import()

*{.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.)

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).

*{.sh,run}: removed extra space between function name and (), which is apparently not needed even though `help function` includes it. this greatly improves readability, including when function names are pasted into commit messages!

*{.sh,run}: changed echo_func to an alias that includes the "$", so that callers don't need to specify the "$" manually. although the original echo_func function is still there, callers need to switch over to the alias at the same time as it's defined because otherwise the "$@" would be doubled, since echo_func refers to the alias instead.

lib/runscripts/import.run: added export_ () command, which is run after import in all ()

moved lib/*.run into runscripts/ subdir so runscripts are grouped together and easier to find rather than being scattered throughout lib/

*run: added include guards

lib/util.run: echo_func (): use the caller's FUNCNAME via the $FUNCNAME[] array instead of requiring them to pass it in the function args as `echo_func "$FUNCNAME" "$@"`

Added lib/import.run