Update input and output formats for pandoc 1.10

Turn pandoc-in/output-formats and pandoc-major-modes into customizable options.
Untabify pandoc-mode.el
Update copyright statement and version number.
Revert pandoc-input-formats to a normal variable.
Unfill pandoc-mode.text
Update version numbers in the manual.
Add new customize options to manual.
Add font and geometry settings to pandoc/latex settings file.
Recreate info, pdf and html files of the manual.