Double the width returned by CTFontGetBoundingBox when drawing. Add box drawing characters for determining the line height. Call freememimage(1) for the character memimage. Fixes #18. Fixes #120. Fixes #146.

MacPorts installs osxfuse under /opt/local.

fontsrv wasn't rendering fontawesome icons, which uses the private use area around 0xf000.

Current versions of osxfuse ship with multiple versions of its kernel extension (kext) for differend versions of macOS. Running mount(1) on macOS with a current version of osxfuse fails with `don't know how to mount (no fuse)' since it fails to find the kext. Running 9pfuse(4) directly works fine. This change adds a check to mount(1) that determines: 1) which version of macOS we're running on 2) if there is an osxfuse kext available for this version of macOS

To use astro(1) and scat(1) one has to create sky/here and download various catalogue files as detailed in sky/README. This change marks those files as ignored by git so they don't clutter its status messages.

TERM_PROGRAM is the customary way to identify which kind of terminal emulator program one uses on macOS. This change sets TERM_PROGRAM to termprog since both variables are used for the same purpose.