[PATCH] Create main() function so script can be called from python modules

[alberto@…]

Attached is a patch that creates a main() function entry point so the script can be easily called programatically from other python modules.

It also "fixes" some accesses to global variable "opts" instead of instance attribute inside MigrateTable which have surfaced when opts is no longer declared in module scope.

Alberto

[alberto@…]

The patch

[pacopablo]

(In [3826])

• Accepted patch to create a main() function that is easily callable from other python modules. Thanks to alberto Closes #3148
• Accepted patch to check for presence of arguments before checking value. Closes #3138