Storage Menu

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Storage menu contains:

Save function
      Save selected function.

Save board
      Save current board.

Save workspace
      Save current workspace(all open boards).

Delete/Load function
      Select a function from the saved functions table
      and load(plot on the current board) it.

Delete/Load board
      Select a board from the saved boards table and load it.
      The loaded board will be added to the current workspace.

Delete/Load workspace
      Select a workspace from the saved workspaces table and load it.
      Current workspace will be lost.


* in case of errors, delete all files in 'storage' directory