Fix data types in boundary handling. Fix deprecation checks.

Fix some data-type issues in boundary handling discovered while patching lbmpy.

• Adapt add_subexpressions_for_field_reads to insert explicit casts when a nondefault data type is required
• Permit modifying the default data type in BoundaryHandling
• Fix target check in handling deprecated vectorization options

changed milestone to %Release 2.0

assigned to @da15siwa

added 1 commit

• 94657080 - Add test cases

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requested review from @he66coqe

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mentioned in commit 19aa1cd5

merged