feature #2039: Remove old template update code
feature #2039: Use wizard to update an existing template
feature #2039: Do not redraw after clearing the data table
feature #2039: Fix update template storage section
  * TODO Check IMAGE_NAME + UID/UNAME
  * TODO Network, Context, Requirements tables
feature #2039: Fix template update network section
feature #2039: Fix features section
feature #2039: Use new function in refresh network button
feature #2039: Fix template update os section
feature #2039: Fix template update scheduling section
  * TODO: Context section
  * TODO: Use _UNAME, NAME ...
feature #2039: Fix template update context section
feature #2039: Improve template update
  * Do not select elements in the table for: OS, CONTEXT, REQUIREMENTS
  * Show inputs for OS, CONTEXT and REQUIREMENTS
  * Add IMAGE|NETWORK_NAME/_UNAME/_UID inputs
  * Select elements in the table for: STORAGE and NETWORK, notify if it is not possible (inputs will be updated)
Merge branch 'feature-2039'