Validity checks for interchange format

[JGuetschow]

Is your feature request related to a problem? Please describe.

When reading data into the primap2 interchange format rules are more lenient than for the native pm2 format, leading to errors on conversion from IF to native format. Examples:

• Entity names can contain characters confusing pint (e.g. HFC-32, where the '-' is interpreted as 'minus')
• More examples to be added

Describe the solution you'd like

Check for consistency with native format to make sure conversion is possible. Currently a validity check is only implemented for the native format.

Describe alternatives you've considered

Keep as is to have less restrictions int he interchange format.

Additional context

Add any other context or screenshots about the feature request here.