Psse: fix the export process

[marqueslanauja]

Please check if the PR fulfills these requirements

• The commit message follows our guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• A PR or issue has been opened in all impacted repositories (if any)

Does this PR already have an issue describing the problem?

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

The attributes XFRRAT and NXFRAT in the case identification data are exported with decimals.
A comment line "/ BEGIN SUBSTATION NODE DATA" is written after the substation record data, which is not supported by PSSE.
The attribute vsref of the facts is considered a double and must be an integer.

What is the new behavior (if this is a feature change)?

The attributes XFRRAT and NXFRAT in the case identification data must be exported without decimals.
The comment line "/ BEGIN SUBSTATION NODE DATA" has been removed.
The attribute vsref of the facts is considered an integer.
Define reasonable buses in the fact records.

Does this PR introduce a breaking change or deprecate an API?

• Yes
• No

If yes, please check if the following requirements are fulfilled

• The Breaking Change or Deprecated label has been added
• The migration steps are described in the following section

What changes might users need to make in their application due to this PR? (migration steps)

Other information:

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud