Clearer Documentation on Server Side Processing

[davidstutz]

• Add clearer documentation on server side processing including selectAllName, checkBoxName and related options. Also include examples of the data retrieved via POST.
• Fix the existing examples for server side processing (e.g. regarding the missing checkboxName option.
• Add more examples for server side provessing.

[davidstutz]

Related: #653, #790, #791.

[sahilchopra]

+1

[iostate]

+1