Evaluate Fun{<:PointSpace} using a Point

[jishnub]

Since a Point may be converted to a Number, we may allow evaluating a Fun{<:PointSpace} at a point as well, so that the following works now:

julia> f = Fun(PointSpace(1:3))
Fun(PointSpace([1, 2, 3]), [1, 2, 3])

julia> f(Point(1))
1

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (768625d) 75.07% compared to head (eb4f043) 75.18%.
Report is 3 commits behind head on master.

Files	Patch %	Lines
src/Spaces/DiracSpace.jl	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #633      +/-   ##
==========================================
+ Coverage   75.07%   75.18%   +0.10%     
==========================================
  Files          80       79       -1     
  Lines        8439     8439              
==========================================
+ Hits         6336     6345       +9     
+ Misses       2103     2094       -9     

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