Adjust parameter names and doc strings to resolve confusion over

Adjust parameter names and doc strings to resolve confusion over
whether "bookmark" meant a bookmark name or a bookmark record.
Along the way, shorten one function's name for similar reasons.

(Issue #7548)

* lisp/bookmark.el
  (bookmark-name-from-record):
    New name for `bookmark-name-from-full-record'.  All callers changed.
  (bookmark-get-bookmark, bookmark-get-bookmark-record,
   bookmark-default-annotation-text, bookmark-prop-get, bookmark-prop-set,
   bookmark-get-annotation, bookmark-set-annotation,
   bookmark-get-filename, bookmark-set-filename,
   bookmark-get-position, bookmark-set-position,
   bookmark-get-front-context-string, bookmark-set-front-context-string,
   bookmark-get-rear-context-string, bookmark-set-rear-context-string,
   bookmark-get-handler, bookmark-edit-annotation, bookmark--jump-via,
   bookmark-handle-bookmark, bookmark-location, bookmark-show-annotation):
    Rename `bookmark' parameter to `bookmark-name-or-record', to
    clearly show its role, and shorten or adjust doc strings accordingly.
  (bookmark-set-name):
    Same, and pass the parameter directly to `bookmark-get-bookmark'
    instead of redundantly doing the callee's work.
  (bookmark-default-annotation-text, bookmark-send-edited-annotation,
   bookmark-relocate, bookmark-insert-location, bookmark-insert,
   bookmark-delete):
    Rename `bookmark' parameter to `bookmark-name', and in some cases
    shorten doc string accordingly.
  (bookmark-rename):
    Change `old' and `new' parameters to `old-name'
    and `new-name', and adjust an internal variable to avoid confusion.
  (bookmark-jump, bookmark-jump-noselect):
    Clarify `bookmark' parameter in doc string.