lib/sh/archives.sh: added compress(), expand(), which handle compression of individual files

fix: lib/sh/archives.sh: unzip(): support -p option, which pipes extracted data to stdout

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}: use new `|| ignore` instead of ignore_e/end_try

lib/sh/util.sh: ignore(): renamed to ignore_e() so ignore() can be used for a simpler, ||-based command

*{.sh,run}: don't use aliases unless it's actually necessary (e.g. to define a var in the calling function, or to alias-expand the next word)

lib/sh/archives.sh: zip(), unzip(): added missing echo_func

lib/sh/util.sh: command(): use just one control var $cmd_log_fd instead of three flags (limit_log_fd, limit_stdout, stderr_is_errors) that indicated various common fd configurations. this is much clearer (you state which fd the common uses as its logging fd), more configurable (the logging fd can be any fd, not just 1 or 2), and more automatic (redirecting fd 2 to err_fd happens automatically if it isn't used for logging).

*{.sh,run}: use new limit_stdout=1 instead of stdout2stderr=1 limit_stderr=1

lib/sh/util.sh: merged limit_stderr_cmd/limit_stdout_cmd into command(), using flag vars to control what limiting actions it needs to perform. in command invocations, this involves setting the appropriate flag vars instead of using a limit_std*_cmd alias.

*{.sh,run}: use new limit_stdout_cmd instead of `stdout2stderr=1 limit_stderr_cmd`

*{.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!

lib/sh/util.sh: split archive (zip) utils out into separate archives.sh