lib/sh/util.sh: skip_stack_frames(): added lookahead support, which looks at entry after current to deterine whether to skip current. this is useful for skipping wrappers, by looking at the calling function's name.

fix: lib/sh/util.sh: skip_stack_frames(): for new skip_stack_frames rather than get_stack_frame behavior, stack frames must be skipped in the caller to preserve the stack frame pointer

lib/sh/util.sh: get_stack_frame_after(): renamed to skip_stack_frames() for clarity

lib/sh/util.sh: added skip_stack_frame_in_caller, unskip_stack_frame_in_caller

lib/sh/util.sh: added prev_stack_frame

lib/sh/util.sh: echo_func(): use new format_stack_frame, which adds call context information to what was provided by func_loc

fix: lib/sh/util.sh: format_stack_frame(): need to hide canon_rel_path() info using log+

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

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

lib/sh/util.sh: next_stack_frame: documented usage

fix: lib/runscripts/util.run: runscript template: all(): moved example commands to target(), where they would more likely be located

lib/sh/util.sh: format_stack_frame(): support including args

lib/sh/util.sh: debugging: added pst() (print_stack_trace)

lib/sh/util.sh: added stack_trace(), print_stack_trace()

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

lib/sh/util.sh: added get_stack_frame() and helpers

lib/sh/util.sh: terminal: moved before errors so it can be used by it

lib/sh/util.sh: errors, debugging: moved after datatype sections so their functions can use these

bugfix: lib/sh/util.sh: canon_rel_path() stub: proper no-op requires passing through original path

lib/sh/util.sh: canon_rel_path(): fall back to original path if can't resolve, instead of errexiting

bugfix: lib/sh/util.sh: canon_rel_path(): don't re-localize $path because this clears it

lib/sh/util.sh: canon_rel_path(): import $1 to $path before function body, so that the function body can be moved to a nested function

lib/sh/util.sh: added canon_rel_path() stub for use by debugging functions

bugfix: /Makefile: install: run bin/install first since config/download depends on it

lib/sh/util.sh: moved func_loc() to before debugging section so it can be used by debugging functions