* srfi-1.scm (filter, filter!): Removed. (Now implemented in the core.)

* srfi-1.scm (filter, filter!): Removed.  (Now implemented in the core.)

* goops/util.scm (filter): Removed.  (Now supplied by core.)

* list.c, list.h (scm_filter, scm_filter_x): New functions.

* debugger/command-loop.scm: Prefix all commands imported from
(ice-9 debugger command-loop) with debugger:.

* boot-9.scm (resolve-interface): Process #:hide; Name custom interfaces
appropriately.
(module-use!, module-use-interfaces!): Remove existing interfaces
on the use-list based on module name rather than interface
identity so that custom interfaces truly replaces their previous
version.