In 73f344f41b, we allowed autoloaded functions to be deleted.
For some reason, funcsave immediately deletes the function it
creates. This previously did very little, since the function would
immediately be re-autoloaded, but with the fix for 73f344f41b
the function gets tombstoned. So the effect is that funcsave
makes the function disappear! This simply removes the erase call,
which dates back to fish 1.x.
* Editor mode is no the default
* Use -i or --interactive or -e fish to edit function in interactive
mode
* tmpname is now created with random number added and check that file
do not already exist
* check $TMPDIR existence and put /tmp if it does not exist
* There is an undocumented feature to use functions, started with dash.
Introduce necessary changes to funced, functions, def_function()
in order to make it work properly.
* Delete editor guessing. Use $EDITOR variable or -e key
Renamed references to the previous command name of save_function to
funcsave, and returned an error after printing the help text when no
arguments are specified.
