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Some clean-up of remez (#223)

* Clean up `freq_eval` interface

  * Don't pass the length of `ad` as an additional argument.
  * Pass frequency instead of `grid` array and index.

* Don't unnecessarily special-case last iteration of a loop

* Choose array lengths based on `nfcns`, eliminate `dimsize`

* Pre-compute cospi(2grid)

* Move transformation of `des` and `wt` into `build_grid`

* Some clean-up of variables

  Don't introduce variables for values used only once so liberally and 
  some related minor clean-up.

* Fix type-stability issue in build_grid

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