lib/sh/util.sh: echo_*func aliases: increase the indent for the duration of the function call. this causes function calls to be displayed in an indented call-tree structure, which makes the verbose output much easier to understand.

bugfix: lib/sh/util.sh: recursive aliases (i.e. aliases that call a command of the same name): use "" around the command name so it isn't reexpanded if the function using the alias is copied using copy_func(). (aliases will be reexpanded every time a function is redeclared since they appear unquoted in the function definition.) this is a bug in `declare -f` for which there is no fix, necessitating the "" alias workaround instead.

lib/sh/util.sh: moved log-indent-related vars/aliases before they are first used (by log())

lib/sh/util.sh: renamed inc_log_level/dec_log_level to shorter log++/log--

lib/sh/util.sh: renamed inc_log_level/dec_log_level to shorter log++/log--

lib/sh/util.sh: renamed cmd_indent to just indent now that indent is not being used for the PS4 level

*{.sh,run}: multi-command aliases: enclose in {} so the alias can be used after ||

lib/sh/util.sh: renamed indent->PS4++ , outdent->PS4-- because these relate just to the PS4 length, not to the (whitespace-based) log_indent

lib/sh/util.sh: removed no longer used echo_run(). use command() instead.

*{.sh,run}: use command instead of deprecated echo_run (don't prepend anything when the command is already aliased with `command`)