Formulas

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Fix
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- (plot): Update schedula to 0.1.12.

- (range): Sheet name without commas has this [^\W\d][\w\.] format.

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Fix
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- (doc): Update schedula to 0.1.11.

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Fix
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- (regex): Remove deprecation warnings.

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Fix
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- (appveyor): Setup of lxml.

- (excel): Remove deprecation warning openpyxl.

- (requirements): Update schedula requirement 0.1.9.

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Fix
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- (setup): setup fails due to long description.

- (excel): Remove deprecation warning `remove_sheet` --> `remove`.