v0.21.0

What's Changed

• Added FieldCollection.from_dict classmethod by @david-zwicker in #262
• Allow specifying boundaries by name by @david-zwicker in #269
• Refactored tracker intervals by @david-zwicker in #267
• Improve parsing of sympy expressions by @david-zwicker in #264
• Improved storage of information about adaptive time stepping by @david-zwicker in #265
• Replace numpy.inf with math.inf by @david-zwicker in #268
• Broadcast scalar results in evaluate by @david-zwicker in #266
• Fixed type issue in Parameterized by @david-zwicker in #261

Full Changelog: v0.20.0...v0.21.0