I am going to improve flags_r11 setting.
I created PR https://github.com/LibreDWG/libredwg/pull/757 which:
* Describe these numbers precisely
* Added flags_r11 from the structure if is defined

One thing is TODO, which I am not able to set now:
* Add ```dwg->header.section[id].flags_r11 = __FROM_CONTROL__``` in https://github.com/LibreDWG/libredwg/blob/master/src/in_json.c#L3264 It helps conversions from JSON to DWG and better ability to test conversion from DWG to JSON and back.
Improve flags_r11 setting in preR13 encoding
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : Improve flags_r11 setting in preR13 encoding
Issue date:

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I am going to improve flags_r11 setting.
I created PR https://github.com/LibreDWG/libredwg/pull/757 which:
* Describe these numbers precisely
* Added flags_r11 from the structure if is defined

One thing is TODO, which I am not able to set now:
* Add ```dwg->header.section[id].flags_r11 = __FROM_CONTROL__``` in https://github.com/LibreDWG/libredwg/blob/master/src/in_json.c#L3264 It helps conversions from JSON to DWG and better ability to test conversion from DWG to JSON and back.
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