Code enhancements and bug fix for geoid

[rogerfraser]

This pull request adds several code enhancements to geoid in the context of working with NTv2 geoid grid files, and addresses a defect relating to reading ASCII NTv2 geoid grid files on Linux, namely the handling of new line characters. On Windows, a new line is represented by a carriage return (CR) and a line feed (LF) as "\r\n", whereas on Unix and Unix-like systems (e.g. Linux, Mac OS, BSD, etc.), a new line is represented by a line feed (LF) only ("\n")

[codecov-commenter]

Codecov Report

Merging #109 (4ebaba7) into master (2cfdde2) will increase coverage by 0.16%.
The diff coverage is 80.24%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   71.11%   71.28%   +0.16%     
==========================================
  Files         117      117              
  Lines       34224    34270      +46     
==========================================
+ Hits        24339    24429      +90     
+ Misses       9885     9841      -44     

Impacted Files	Coverage Δ
dynadjust/dynadjust/dnageoid/dnageoid.hpp	100.00% <ø> (ø)
dynadjust/dynadjust/dnageoid/dnageoid_ext.hpp	100.00% <ø> (ø)
dynadjust/include/config/dnaoptions.hpp	29.23% <ø> (ø)
dynadjust/dynadjust/dnageoid/dnageoid.cpp	68.55% <77.34%> (+1.23%)	⬆️
...just/dynadjust/dnageoidwrapper/dnageoidwrapper.cpp	79.75% <90.32%> (-0.18%)	⬇️
...st/dynadjust/dnaadjustwrapper/dnaadjustwrapper.cpp	87.43% <100.00%> (+1.28%)	⬆️
dynadjust/include/functions/dnaiostreamfuncs.hpp	66.66% <100.00%> (+1.96%)	⬆️
dynadjust/dynadjust/dnaadjust/dnaadjust.cpp	86.85% <0.00%> (+0.35%)	⬆️
...t/dynadjust/dnaadjustwrapper/dnaadjustprogress.cpp	61.32% <0.00%> (+0.55%)	⬆️
... and 1 more

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