new flag introduced: it forces prompt context that is sent to backend, be more explicit

[vibrys]

@karthink, thank you very much for the great gptel package. It's great value is noticeable.

I'm issuing PR to prevent users from accidental sending too many data during requesting from org mode buffer.

The idea is to force both branching and topic be present on the path. If they both are included, then one may assume the user set these two intentionally thus sends that part of buffer (s)he wants.

the setting by default is nil (nothing changes to existing users), but IMO it may be considered to be set to true as default.

please let me know what you think about the change.

kind regards, Vibrys