Add options for Pandoc 1.10

* --toc-depth
* --epub-chapter-level
* --html-q-tags
Capitalize descriptions for --old-style-headers and --no-tex-ligatures
Move binary options to separate submenu
Delete newline in menu code
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.
Remove markdown_mmd as in/output format.

Add markdown_github as input format.
Add new in/output format to the menu.
Fix bugs in customization options pandoc-output-formats and pandoc-major-modes
Construct output format submenu on the basis of pandoc-output-options customization option.
Set input format menu on the basis of pandoc-input-formats
Change "output format" to "input format" in pandoc-major-modes
Fix typo in the manual.