Ability to open a keystore and search for a cert via the cert file

[bdw429s]

I put in ticket #64 to have a basic keystore search feature within the GUI, but along the same lines, sometimes I have a cacerts keystore and I also have a cert file (possibly exported from my browser) and I'd like to check and see if that cert file, or one of the certs in its path is in the store. It would be great to be able to open a key store, and then choose a cert file and have Portecle check and see if that cert or one of the certs in its path is in the store. This would be great to troubleshoot issues connecting to HTTPS endpoints when the root cert is missing from my store.

[bdw429s]

And to add to this-- it would be even cooler to open up a store, then use the "Examine SSL/TSL Connection" to specify a domain and have Portecle tell me if that cert is going to be trusted based on the open keystore.