Enabling UI build back

[tomusdrw]

Issue a) solved by change in Cargo.precompiled.toml
Issue b) cannot be reproduced.

[jacogr]

cargo build --release --no-default-features --features ui Works as expected, as does cargo build --release

[coveralls]

Changes Unknown when pulling 4f643e5 on ui-full-build into * on master*.

[gavofyork]

would prefer to remove the reliance on --no-default-features for this stuff altogether.