pretty printing for HeckeMap

[simonbrandhorst]

No description provided.

[simonbrandhorst]

Will break doctests in Oscar.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04% 🎉

Comparison is base (84fe6d0) 74.41% compared to head (7e495fb) 74.45%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1213      +/-   ##
==========================================
+ Coverage   74.41%   74.45%   +0.04%     
==========================================
  Files         346      346              
  Lines      110798   110797       -1     
==========================================
+ Hits        82451    82496      +45     
+ Misses      28347    28301      -46     

Files Changed	Coverage Δ
src/Map/MapType.jl	98.93% <100.00%> (-0.02%)	⬇️

... and 29 files with indirect coverage changes

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[thofma]

I find it a bit confusing, to do a println(f) in the doctest, just so that some other printing is tested.

[simonbrandhorst]

So you suggest calling show(X) instead? Will do next time.