* module/system/xref.scm (procedure-callers): Rework to calculate the
callers of a *variable*, not of a value. This is because the
module-observers only get fired when the module changes, not with the
variables change values. Also accept either a variable, a symbol
(resolved in the current module), or a modname . symname pair.
* module/system/xref.scm: Implement procedure-callers, as the inverse of
procedure-callees, with a cache invalidated by changes in modules.
* module/ice-9/boot-9.scm (module-use!): Don't poke module observers when
module-use! is called for an already-used module.
* module/system/xref.scm (hacky-procedure-callees): Add a
procedure-callees implementation for procedures with source, that
currently does nothing. Not sure what to do, going into the future.
