Allow for change in maxevals in gram.jl

[GeorgAUT]

For evaluation of the boundary conditions. This may not be ideal - would be better if could extract maxevals from options..., but I could not get that to work.

[codecov]

Codecov Report

Merging #41 (acaec6d) into master (65efd6b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #41   +/-   ##
=======================================
  Coverage   61.67%   61.67%           
=======================================
  Files          89       89           
  Lines        5584     5584           
=======================================
  Hits         3444     3444           
  Misses       2140     2140           

Impacted Files	Coverage Δ
src/bases/dictionary/gram.jl	74.31% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 65efd6b...937a418. Read the comment docs.

[GeorgAUT]

Excellent idea, the above is updated in this branch, should automatically merge through the pull request.