... Also in the newer versions you can bump the fee for a transaction after it has already been sent 
Only if the transaction is marked "replaceable"... which, I think by default, only occurs with what Electrum defines as "low fee" transactions... otherwise you have to go into the "tools -> "preferences" -> "fees" and select "Always" from the dropdown for "Propose Replace-By-Fee"...Also, only the Sender can try and bump the fee... if you're receiving bitcoins and they're unconfirmed due to low fee, your only option is "Child Pays For Parent"...
Electrum supports two technologies for increasing fees for a transaction that has already been sent. RBF which does require that you mark the transaction as replaceable when you originally sent it. And Child pays for parent (CPFP) which only requires that you control one or more receiving addresses. The OP can use CPFP to bump the fee because it's very likely the transaction generates change and he controls the change address.
