* minibuffer.el (completion-all-completion-with-base-size): New var.

* minibuffer.el (completion-all-completion-with-base-size): New var.
(completion--some): New function.
(completion-table-with-context, completion--file-name-table):
Return the base-size if requested.
(completion-table-in-turn): Generalize to multiple arguments.
(complete-in-turn): Compatibility alias.
(completion-styles-alist): New var.
(completion-styles): New customization.
(minibuffer-try-completion, minibuffer-all-completions):
New functions.
(minibuffer--do-completion, minibuffer-complete-and-exit)
(minibuffer-try-word-completion): Use them.
(display-completion-list, minibuffer-completion-help): Use them.
Handle all-completions's new base-size info to set completion-base-size.
* info.el (Info-read-node-name-1): Use completion-table-with-context,
completion-table-with-terminator and complete-with-action.
Remove the now obsolete completion-base-size-function property.
* simple.el (completion-list-mode-map): Move init into declaration.
(completion-list-mode): Use define-derived-mode.
(completion-setup-function): Use any completion-base-size that may
have been set before.  Remove handling of completion-base-size-function.
* loadup.el: Move abbrev.el up earlier.