Create separate "editor" sections to support several Coq editors.
For now, there is no autodetection of the editor. The purpose of this patch is only to provide the user with sane defaults and to avoid reusing prover options as editor options. So the user has to manually edit the why3.conf file to modify a prover/editor association. Tested with Coqide 8.3 and Proof General 4.1.
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