Fixed fieldconvert addflds module

Issue/feature addressed

FieldConvert -m addfld wasn't working properly as ProcessCreateExpansion.cpp isn't executed (which should be the 3rd module sequence) causing a segmentation fault from m_f->m_exp[0] in ProcessAddFld.cpp:161.

Proposed solution

Create a member function GetModulePrerequisites in class Module that defines define a list of prerequisite modules that should be loaded. In this case (of addflds), createExp is added as a prerequisite module of addflds.

Implementation

• Added member function GetModulePrerequisites to class Module in Module.h:224
• Added createExp as a prerequisite module for ProcessAddFld.h:83
• Added a for-loop that checks for prerequisite modules and load them in FieldConvert.cpp:479
• Added a logic that prevents double loading modules in FieldConvert.cpp:488

Tests

Added regression tests chanflow_m8_addfld.tst that adds chanflow_m8_addfld.fld to itself with xml file chanflow_m8_addfld.xml.

Suggested reviewers

Notes

Checklist

• Functions and classes, or changes to them, are documented. - [x] User guide/documentation is updated.
• Changelog is updated.
• Suitable tests added for new functionality.
• Contributed code is correctly formatted. (See the contributing guidelines).
• [x] License added to any new files.
• No extraneous files have been added (e.g. compiler output or test data files).