[749][libnetcdfutils] Added default constructor, fixed an issue with...

[749][libnetcdfutils] Added default constructor, fixed an issue with thisVarType, formatted, spellchecked, updated some comments

Squashed commit of the following:

commit 0842f1be4979b6847b3da5153caf6477e544fe89
Author: Don Shea <don.shea@nasa.gov>
Date:   Mon Nov 25 15:53:55 2024 +0000

    Modify a comment for non-copy constructor

commit b1d9787a
Author: Jakob Lindo <jakob.c.lindo@nasa.gov>
Date:   Mon Nov 25 09:15:03 2024 -0500

    [#749][libnetcdfutils] Added default constructor, fixed an issue with thisVarType, formatted, spellchecked, updated some comments