(reftex-finding-files): Group documentation fixed.

(reftex-finding-files): Group documentation fixed.
(reftex-toc-toggle-file-boundary, reftex-toc-toggle-labels,
reftex-toc-toggle-context,reftex-find-start-point): New functions.
(reftex-toc-include-labels, reftex-toc-include-context,
reftex-toc-include-file-boundaries,
reftex-toc-keep-other-windows): New options.
(reftex-use-text-after-label-as-context): Option removed.
(reftex-extract-bib-entries): Protect use in non-latex buffers.
(reftex-toc-visit-location): Renamed from `reftex-toc-visit-line'.
(reftex-latin1-to-ascii): Works now with and without Mule.
(reftex-truncate): Removed special stuff for Emacs 20.2.
(reftex-get-offset): Made more general.
(reftex-show-label-location): Renamed from
`reftex-select-label-callback'.
(reftex-pop-to-label): Function removed (using
`reftex-show-label-location' instead.
(reftex-insert-docstruct): Renamed from
`reftex-make-and-insert-label-list'.  Function args changed.
(reftex-toc): Now uses `reftex-insert-docstruct' and
`reftex-find-start-point'.
(reftex-select-item): Use `reftex-find-start-point'.
(reftex-toc-visit-line): Can display labels and file boundaries.
(reftex-TeX-master-file): `(TeX-master-file)' protected.