Fix IO issues for 'io.network_from_csv'

[hpc-dave]

Here, two issues are addressed:

1. A DtypeWarning appears when using 'io.network_from_csv', that mixed types were encountered. Since specifying the dtype is not generally possible, the flag low_memory=False has to be set to avoid this warning by pandas.
2. For the columns with boolean values, pandas keeps the general Object type (dtype('O')), which can lead to issues later on, especially when trying to use the values directly. Especially nasty to debug when used in combination with topotools. This issue is fixed by adding an additional conversion step at the end of the function 'io.network_from_csv'

Note:

• pytest is currently failing due to updates in scipy 1.15,*, see discussions here and here

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.7%. Comparing base (18d004e) to head (df66574).
Report is 8 commits behind head on dev.

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #2959   +/-   ##
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  Coverage   89.7%   89.7%           
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  Files        148     148           
  Lines       8662    8665    +3     
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+ Hits        7774    7777    +3     
  Misses       888     888