Compilation fails with solc 0.5.8

Error:
```
/lib/dappsys/stop.sol:33:34: TypeError: This modifier uses "msg.value" or "callvalue()" and thus the function has to be payable or internal.
function start() public auth note {
^--^
/lib/dappsys/note.sol:36:20: "msg.value" or "callvalue()" appear here inside the modifier.
wad := callvalue
^-------^
```

Start by reproducing the reported compilation error with solc 0.5.8 and read /lib/dappsys/stop.sol around line 33 and /lib/dappsys/note.sol around line 36. Trace how the modifier is used by start(); done means the project compiles successfully with solc 0.5.8 without this error.

Written by the indexing model from the issue text.