Added `defaultDocumentFilePath` preference and modified `Maka` module to
use it, but not display an error dialog if the default document is
absent.
Implemented initial version of `DeviceManager` module to support
commands that read data from devices, and implemented "z" command for
HMMC command interpreter. Also implemented dummy theodolite device and
added support for preference file comments.
Modified preferences to specify use of Sokkia DT500 theodolite rather
than dummy theodolite.
Merge branch 'master' of https://github.com/HaroldMills/Maka.git