Increase lower bound for W1 in tilesearch.jl.

[chriselrod]

Octavian.jl/src/global_constants.jl

Line 24 in d47b39f

const W₁Default = 0.1 # TODO: relax bounds; this was the upper bound set for the optimizer.

These parameter values were found by my Haswell laptop:

const W₁Default = 0.1 # TODO: relax bounds; this was the upper bound set for the optimizer.
const W₂Default = 0.15989396641218157
const R₁Default = 0.4203583148344484
const R₂Default = 0.6344856142604789

Obviously, setting the upper bound to W₁Default at 0.1 was too low. So I'm setting it to 0.2 here.

[chriselrod]

We may want to do something like this:
JuliaArrays/OffsetArrays.jl#183

As changing the benchmarks directory or README won't have any impact on any of the tests, so no need to rerun them.
They're not taking 3 hours right now, so it isn't that big of a deal. But something to consider.

[codecov]

Codecov Report

Merging #59 (326889b) into master (d47b39f) will increase coverage by 1.39%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   41.20%   42.59%   +1.39%     
==========================================
  Files          12       12              
  Lines         716      716              
==========================================
+ Hits          295      305      +10     
+ Misses        421      411      -10     

Impacted Files	Coverage Δ
src/init.jl	60.00% <0.00%> (-10.00%)	⬇️
src/matmul.jl	41.56% <0.00%> (-0.42%)	⬇️
src/macrokernels.jl	22.51% <0.00%> (+6.80%)	⬆️

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