Create paste-invoke script

[ianb]

You can do #!/usr/bin/env paster , but it's hard to detect the #! in some environments. Under csh in particular it seems to be impossible. There should be a paster-invoke (or invoke-paster to help tab completion?) that is unambiguous about being used in a #! environment.

Also, there should be a way to have indirection, so that you can essentially say "run the file over there..." and you can put the [exe] section separate from the config itself, or put the whole thing elsewhere.