Latex module revamped

Latex language module with previews, latexmk, reftex, bibtex and others.
Completion with company mode.
Selection of bibliography using Ivy or Helm.
Later preview panel or okular as viewers.
LatexMk for compiling code.
Prettified indentation with adaptive-wrap along with good indentation of environments.
Additional fontification of common commands.

modules/lang/latex/README.org

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+#+TITLE: :lang latex
+
+* Module Description
+Provide a helping hand when working with LaTeX documents.
+
+** Feature:
++ Sane defaults
++ Fontification of many popular commands
++ Pretty indentation of wrapped lines using the ~adaptive-wrap~ package
++ Spell checking with ~flyschek~
++ Change PDF viewer to Okular or ~latex-preview-pane~
++ Bibtex editor
++ Autocompletion using ~company-mode~
++ Ivy or Helm for selecting bibliography
++ Compile your .tex code only once using LatexMk
+
+
+* Customization
+
+** Custom Variables
+Two custom variables state where AUCTeX will search for bibliography files and their corresponding PDFs.
+Set these variables in your private configuration with:
+#+BEGIN_SRC emacs_lisp
+(set! :latex-bibtex-file "./your/bib/file.bib")
+(set! :latex-bibtex-pdfs-dir "./dir/with/bib/pdfs/")
+#+END_SRC
+If the variables are not set, they are ignored.
+
+** LatexMk
+Use LatexMk instead of normal LaTeX to compile documents. LatexMk only needs to run once to get all references, bibliography and other things right.
+
+Activate with the flag '+latexmk' of the latex module in init.el.
+#+BEGIN_SRC emacs_lisp
+(latex +latexmk)
+#+END_SRC
+
+** Okular
+Use Okular as default PDF viewer.
+
+Activate with the flag '+okular' of the latex module in init.el.
+#+BEGIN_SRC emacs_lisp
+(latex +okular)
+#+END_SRC
+
+** Preivew-Pane
+Instead of using an external program to display rendered .tex files, use an emacs window to display the rendered file. 
+
+This flag is incompatible with the ~+okular~ flag.
+
+Activate with the flag '+preview-pane' of the latex module in init.el.
+#+BEGIN_SRC emacs_lisp
+(latex +preview-pane)
+#+END_SRC