Add documenation for image meta/properties cmds
Refs: #4231
Fix some typos in docs
Use container:path format in register
Refs: #3778
Fix typo == --> --
Add network examples
Add examples for virtual machine handling
Add image registration examples
Add file sharing examples
Add upload and download examples
Complete the listing section
Rename: scenarios-->examples, add first content
- configuration section, with clouds- Simple listing- Pithos advanced listing