runtime and build handling ex metadata

[kjdon]

Currently only GLI "knows about" ex metadata. GLI strips ex off before writing out the config file.

This is confusing for users, who have to write different things when they are in GLI compared with editing config file by hand.

Make the whole system accept ex metadata.

• build code (classifiers, index etc) - can we just strip off when reading in config file
• runtime - format statements need to strip off ex. anywhere else?

Then we can get rid of the horrible code in GLI which is looking for ex. and removing it.

[kjdon]

fixed for gs2. still need to do gs3.