Delete dead code surrounding ArrayBase.strides attribute (Closes #144 on gitlab)

Closes #144

See merge request inducer/loopy!274

Fix missing argument to format string

See merge request inducer/loopy!273

Use cgen version in data model version

See merge request inducer/loopy!272

Array arg plus renaming

See merge request !270

1.  Literal to vector assignment (no explicit conversion should be used)
2.  Non-vector temporary variable to vector assignment (no explicit conversion)
3.  Vector-temporary to vector variable assignment (explicit conversion)

Previously, only vector to vector assignment was tested.

This reverts commit 61653be0.

incorporate two different privitizing 'flavors', one for ILP and one for vectorization -- the main difference is that vectorization requires a _direct_ write-dependency on the vectorizing iname, whereas an ILP promotion simply requires that the temporary is inside an ILP-loop

Improve error message for prefech-on-indirect-access, add test (#104 on gitlab)

See merge request inducer/loopy!183

Correct improper use of 'find_recursive_dependencies', this refers to user-specified instruction dependencies, not general 'dependencies'.
Besides the recursive write-map application technique is capable of handling the cases the recursive instruction dependency approach was trying to fix

Precompute default tag mandatory

See merge request inducer/loopy!268