Add access to values of properties

[alkino]

API can be discussed

[alkino]

I wonder if we should return tuple instead of having one getter for each value.

Should we do a static function instead?

static std::tuple<hsize_t, hsize_t> fromDataTransferProps(dxpl);

[codecov-commenter]

Codecov Report

Merging #684 (52da3ee) into master (4e5e971) will increase coverage by 0.07%.
The diff coverage is 85.93%.

@@            Coverage Diff             @@
##           master     #684      +/-   ##
==========================================
+ Coverage   80.28%   80.35%   +0.07%     
==========================================
  Files          68       68              
  Lines        4113     4123      +10     
==========================================
+ Hits         3302     3313      +11     
+ Misses        811      810       -1     

Impacted Files	Coverage Δ
include/highfive/H5PropertyList.hpp	93.33% <0.00%> (-4.17%)	⬇️
include/highfive/bits/H5PropertyList_misc.hpp	72.46% <85.45%> (+8.60%)	⬆️
include/highfive/H5Group.hpp	100.00% <100.00%> (+14.28%)	⬆️
include/highfive/bits/H5File_misc.hpp	95.23% <100.00%> (+7.89%)	⬆️

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[matz-e]

I think it looks pretty clean. The only place I'd return a pair is for the version bounds.

And we don't have too many other free functions, do we? So your current API seems fine to me.