Update of the development part of the doc

* Fixed macros linking and formatting
Update of appendices of the doc

* Updated datetime formatting, command line options and environment
  variables
Update of usage, development and appendices sections of the doc
Temporary disabling of doc sections
Update of screenshots in doc

(references OpenFLUID/openfluid#101)
Update of documentation

* Fixed mispell errors
* Updated layout
* Updated HTML stylesheet

(references OpenFLUID/openfluid#101)