Added a new section to the global config file, template. It has two fields:
message and description, used to populate corresponding fields during
pijul record, unless overridden via a switch.
Analogous to git's commit.template, but as an inline string rather than a
filepath.
The config file is now parsed unconditionally: previously it was used only for
fallbacks, but description was never set to anything, making the config the
primary source.
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