(This shouldn't require any actual changes.)

Collect timing data

See merge request inducer/sumpy!83

expected to use it

Revert "Merge branch 'exp-wrangler-logging' into 'master'"

See merge request inducer/sumpy!88

This reverts merge request !87

Add logging decorators to FMM expansion wrangler

See merge request inducer/sumpy!87

Upgrade sympy to 1.1.1 in CI

See merge request inducer/sumpy!86

Cleaned up MatrixBlockIndex

See merge request !85

* renamed BlockIndex to BlockIndexRanges.
* renamed `view` to `take`, since the methods allocate and would cause
confusion.
* reduce the number of queues being passed around.

* created a new class that holds 1D block index information.
* add a few convenience functions to hide the implementation details.
* make everything work with cl arrays and add some functions to do a
mass get() on all the arrays.

qbx: fix block generator with additional source vectors

See merge request !84

Depends on pytools!14.

Rework block generator

See merge request !78