Make MRGT/HRGT work without TRRT (or other (new) tools)

[RieksJ]

Currently, an MRG entry has fields that are needed to accommodate for term ref resolution. Examples include 'locator', and 'website'.

There are situations in which term ref resolution is not needed; the tools are simply used to generate MRGs and HRGs from them.

To better accommodate such situations, it should be possible to have CTEXT headers (and MRG entries) to ONLY have fields that are relevant for the contexts in which they will be used. That would obviously include MRG-generation, but whatever else would be relevant depends on context.

It seems as if the following terms would remain 'required', and the rest not (to be verified):

• scopetag
• vsntag
• termid
• term
• termType