Improve lambda/pi formatting

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
Add Import command

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
Add option declarations. Add Help.

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
Fix unused variable warnings

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>