Implemented a heuristic backward search.

* lisp/pdf-sync.el: (pdf-sync-backward-hook): Added hook as option for
word-wise searching.
(pdf-sync-minor-mode-map): Add seemingly standard binding C-mouse1 for
backward searches.
(pdf-sync-backward-use-heuristic): New variable. If this is non-nil
the backward search uses a heuristic which will in most cases locate
the character position.
(pdf-sync-backward-text-translations): New variable describing a
mapping between utf8 character and latex macros.
(pdf-sync-backward-text-flush-regexp): Regexp for deleting
unhelpfull character from the PDF's text when backward-searching.
(pdf-sync-backward-source-flush-regexp): Regexp for deleting
unhelpfull LaTeX fragments when backward-searching.
(pdf-sync-backward-search): Use the heuristic.
(pdf-sync-backward-correlate): Now returns a function (instead of line,
column), which when called will move to the correct position.
(pdf-sync-backward--find-position
pdf-sync-backward--get-source-context,
pdf-sync-backward--source-strip-comments,
pdf-sync-backward--get-text-context,
pdf-sync-backward--tokenize): New functions for the heuristic backward search.
(pdf-sync-backward-debug-minor-mode,
pdf-sync-backward-debug-wrapper,
pdf-sync-backward-debug-explain): Debug functions.

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