Fixed data storing

[hammannr]

If toy data is already assigned to the model, it will be converted to alea.utils.ReadOnlyDict. So far, this type was not supported by the builtin model.store_data() method, which is changed with this PR.

Now you can:

model = ...
model.data = model.generate_data()
model.store_data(file_name, [model.data])

[coveralls]

Pull Request Test Coverage Report for Build 8378431339

Details

• 6 of 8 (75.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 91.87%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
alea/utils.py	4	6	66.67%

Totals
Change from base Build 8358317933:	-0.03%
Covered Lines:	1503
Relevant Lines:	1636

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💛 - Coveralls

[dachengx]

Thanks @hammannr . Looks good to me. Please add a test to make sure that the previously ignored usage case is supported after this PR.