*{.sh,run}: echo all global vars (except those defined before echo_vars is available)

web/links/index.htm.run: use the runscript-common $top_file, which is equivalent to $linked_file

*{.sh,run}: use new local_export instead of local...export. this still requires calling echo_vars manually, because local_export is an alias (and must be, to define the var in the caller's context).

lib/sh/util.sh: added local_export alias, which combines the effects of local and export

lib/sh/util.sh: renamed params() to kw_params() to clarify the type of params it handles

lib/sh/util.sh: logging: echo all keyword params by overriding params(). this requires removing manual echo_vars calls.

lib/sh/util.sh: moved functions section right after exceptions, so that other sections can use it. in particular, func_override is needed by verbose output to override non-verbose versions of functions.

lib/sh/util.sh: only try to echo vars that are set, to avoid `declare -p` "not found" errors

: use new `params` in all functions that have keyword params, in order to remove their vars from the environment. note that functions that use $? (such as die()) must save it *before running params, because params will overwrite $?.

web/links/index.htm: updated to Firefox bookmarks. added bash and MySQL-related bookmarks, including MySQL doc subfolder.