updates point location routines; updates station duplets search (by hash table)

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: 65 lines in your changes are missing coverage. Please review.

Comparison is base (af9762d) 51.48% compared to head (94b30e7) 51.47%.

Files	Patch %	Lines
src/specfem3D/read_stations.f90	31.64%	54 Missing ⚠️
src/specfem3D/locate_point.f90	86.48%	5 Missing ⚠️
src/specfem3D/locate_receivers.f90	42.85%	4 Missing ⚠️
src/shared/read_topo_bathy_file.f90	95.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1653      +/-   ##
==========================================
- Coverage   51.48%   51.47%   -0.01%     
==========================================
  Files         266      266              
  Lines       60136    60234      +98     
==========================================
+ Hits        30961    31008      +47     
- Misses      29175    29226      +51     

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