fuoexec: allow reload fuorc to debug easily

[cosven]

Assume we have the following code in fuorc

when('app.ui.songs_table.about_to_show_menu', ask_ai_background, use_symbol=True)

Before, if user execute fuo exec < ~/.fuorc multiple times, when the signal is emitted, the slot will be invoked multiple times.

[coveralls]

Pull Request Test Coverage Report for Build 9367635409

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 55.241%

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Totals
Change from base Build 9350982342:	0.002%
Covered Lines:	9823
Relevant Lines:	17782

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💛 - Coveralls