Resolves BoundError in weights(hook_lengths(...))

[JohnAAbbott]

The weight function now checks that its arg is semi-standard, and gives a helpful error if not.

The proposed name change discussed in issue #4230 (replace weight by weight_sequence) has not been implemented.

Resolves #4230.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.48%. Comparing base (b056c72) to head (0ccd936).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4270      +/-   ##
==========================================
- Coverage   84.60%   84.48%   -0.12%     
==========================================
  Files         640      641       +1     
  Lines       85122    85428     +306     
==========================================
+ Hits        72014    72171     +157     
- Misses      13108    13257     +149     

Files with missing lines	Coverage Δ
...Combinatorics/EnumerativeCombinatorics/tableaux.jl	96.43% <100.00%> (+<0.01%)	⬆️

... and 31 files with indirect coverage changes