implement function load_arrays() (to use in viewer only)

[alixdamman]

It appears that some users would like to have a function that does same thing as edit() does:
search for all existing LArray objects and create a Session + save it.

Same with a 'load_arrays' function : load a Session and put all arrays in the current namespace.

[gdementen]

• unsure having save_arrays() is worth it when we already have local_arrays().save()
• load_arrays() should be implemented so that we can do the equivalent of File->Open via the console, but we should make it clear in the documentation that it should only ever be used in an interactive console and not in a script (because users/editors/... lose the ability to track where each variable comes from).

[alixdamman]

I didn't know local_arrays() already exist. Now I know. Sorry.

[gdementen]

np :)

[alixdamman]

The function is not documented. Is there a reason for that (users should not use it)?

[gdementen]

Just an oversight I guess.