Eliminate usages of old name 'equation collection' for `AssignmentCollection`
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@@ -16,12 +16,12 @@ class AssignmentCollection:
@@ -16,12 +16,12 @@ class AssignmentCollection:
Additionally a dictionary of simplification hints is stored, which are set by the functions that create
subexpression_symbol_generator: generator for new symbols that are used when new subexpressions are added
@@ -344,7 +344,7 @@ class AssignmentCollection:
@@ -344,7 +344,7 @@ class AssignmentCollection: