gerber exports edge cuts to gm1 in stead of gml

[simski]

Application: kicad
Version: no-vcs-found-50716c9~58~ubuntu16.04.1, release build
Libraries: wxWidgets 3.0.2
           libcurl/7.47.0 OpenSSL/1.0.2g zlib/1.2.8 libidn/1.32 librtmp/2.3
Platform: Linux 4.4.0-78-generic x86_64, 64 bit, Little endian, wxGTK
- Build Info -
wxWidgets: 3.0.2 (wchar_t,wx containers,compatible with 2.8)
Boost: 1.58.0
Curl: 7.47.0
KiCad - Compiler: GCC 5.4.0 with C++ ABI 1009
        Settings: USE_WX_GRAPHICS_CONTEXT=OFF
                  USE_WX_OVERLAY=OFF
                  KICAD_SCRIPTING=ON
                  KICAD_SCRIPTING_MODULES=ON
                  KICAD_SCRIPTING_WXPYTHON=ON
                  KICAD_SCRIPTING_ACTION_MENU=ON
                  BUILD_GITHUB_PLUGIN=ON
                  KICAD_USE_OCE=ON

export edge cuts using protel extensions. notice .gm1 (one as a count) as extension. board hose expects .gml (el as in level)

[jean-pierre charras (jp-charras)]

The only one *official* Gerber file extension is .gbr

The assumption "board house expects .gml" is false.

Depending on docs found on Google, edge cuts using protel extensions is .gm1 or .gml.

In any case, using .gm1 is *not* a bug.