Changes:
1. rename the sandstorm "manage" permission to "edit"
(old permission names: view, add, manage;
new permission names: view, add, edit).
Rationale: "edit" best describes this permission's current powers, to users and to operators.
If we ever added more manager-type features we'd want that to be a new permission,
not a rename of the existing one (which would change the powers of existing users).
2. rename the sandstorm roles for consistency with permissions
(old role names: viewer, editor, manager;
new role names: viewer, adder, editor)
Rationale: it's needed to avoid confusion.
3. add a new option: --allow=view|add|edit|sandstorm (default: add).
'sandstorm' sets permissions according to the X-Sandstorm-Permissions header.
Drop the --capabilities and --capabilities-header options.
Rationale: it's simpler and more intuitive.
4. replace "capability" with "permission" in ui/docs/code.
Rationale: consistent with the above, more familiar.
Now not broken, https rather than http, and pointing to the "Data
formats" section, which has links to each of the file formats
(in case editing a non-journal file).
This is useful when serving on 0.0.0.0, such that querying from any
other device with <IP>:<PORT> does not fallback to 0.0.0.0:PORT,
which would fail.
Tested: Manually
Changes to enable more control of "rounding" behaviour
(ie, choosing display precisions for amounts).
This reverts 1.31's change of asprecision, making it a non-Maybe
again, and adds a new asrounding field providing more control over how
a target display precision is applied to existing amounts (two options
for now, more later). Functionality is in an interim state (reports do
no rounding).
A quantity with a unit like "15m" was being parsed internally as
0.249999999... rather than 0.25 (and since hledger 1.21, printed that
way also). Now we round such quantities to two places during parsing,
to get exact quarter-hour amounts.
