Convert standard_kconfig() to argparse for better feedback

Stuff like this is not the pinnacle of helpful design, and hides that
the commands actually have long help texts (that can be viewed with
pydoc):

    $ ./menuconfig.py --help
    [Errno 2] No such file or directory: '--help'

Fix it by converting standard_kconfig() to argparse, and add a
'description' argument to it for the command-specific help text. --help
now shows the same help text shown by pydoc, and some other error
messages are improved as well.

Also fix some copy-paste errors and outdated paths in the help texts for
the all*config commands.

1 files changed, 1 insertions, 1 deletions

diff --git a/olddefconfig.py b/olddefconfig.py
index a59a7d4..a4efd9a 100755
--- a/olddefconfig.py
+++ b/olddefconfig.py
@@ -19,7 +19,7 @@ import kconfiglib
 
 
 def main():
-    kconf = kconfiglib.standard_kconfig()
+    kconf = kconfiglib.standard_kconfig(__doc__)
     print(kconf.load_config())
     print(kconf.write_config())