Document presence of bashisms in some Make rules.

* Makefile.in: Mention that bash shell is required for windows-package
and release-upload recipes due to some bashisms in them.  Reported by
José Carlos Santos.
Omit f-f hooks and more with TeX-region-create

* tex-buf.el (TeX-region-create): Disable finding of appropriate
major-mode for region file.  Also disable file-local vars, and
don't run find-file-hook functions.  Also, make the region file
read-only to prevent accidental editing where actually the real
file should have been edited (happens easily with source
correlation mode).
Use more consistent fontification in some styles

* style/zlmtt.el (font-latex-add-keywords): Use more consistent
	fontification.

* style/textcomp.el (font-latex-add-keywords): Ditto.

* style/fontaxes.el (font-latex-add-keywords): Ditto.

* style/XCharter.el (font-latex-add-keywords): Ditto.

Signed-off-by: Tassilo Horn <tsdh@gnu.org>
Adapt bug intro text for debbugs.

* tex.el (TeX-submit-bug-report): Adapt bug report intro text to
mention debbugs url.
Implement inverse/backward search for TeX regions.

* tex.el (TeX-source-correlate-sync-source): Make backward/inverse
search form PDF to tex work also for TeX-regions.

* tex-buf.el (TeX-region-orig-buffer): New variable.
(TeX-region-create): Set TeX-region-orig-buffer.
Fix fontification of a couple of fontspec macros.

* style/fontspec.el ("fontspec"): Fix fontification of
"newfontfamily" and "newfontface".
Fix indentation in LaTeX-env-figure in a corner case.

* latex.el (LaTeX-env-figure): Fix indentation when there is the
\centering macro and no caption is inserted.