lib.FileContext.put(): Add parameter "atomic"

Add the parameter "atomic" to put() / _put(). If instructs the
implementation to take extra precautions to make sure the operation
either succeeds or fails entirely, i.e. doesn't leave a broken target
file behind.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/ec/Curl.py

@@ -44,17 +44,3 @@ class Curl(Base):
             path = '/' + path
         cmd.append(self.__base_url + path)
         return await self.__ec.run(cmd, throw=throw, verbose=verbose)
-
-    async def _put(
-        self,
-        content: bytes,
-        path: str,
-        wd: str|None,
-        throw: bool,
-        verbose: bool|None,
-        title: str,
-        owner: str|None,
-        group: str|None,
-        mode: str|None,
-    ) -> Result:
-        raise NotImplementedError()