Spell-check flow improvements

A "back button" to go back to the previous spellcheck error / just modified error. If the file have lots a Names it's difficult to find
where i was when i miss click.
The Edit button open a new popup window, could be nice if we can edit directly in the current spellcheck window to save some time.
On spellcheck window open, a "continue where you left of ?" could be nice. I frequently need to exit the spellcheck window to do some search and replace, and because there is lots of names in the file, i have to start spellcheck again from the beginning.

Thank you. (small paypal donation done, i use Gaupol frequently)

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