Fix and add info messages

[gavofyork]

• Client handles the enode message to avoid repeats.
• Display journal DB strategy on startup.

[rphmeier]

impl<T: AsRef<str>> Applyable for T { ... }

this will cover all 3 implementations here.

at that point it may be better just to have a free function fn apply_style<T: AsRef<str>>(x: T, c: Style) -> String

[gavofyork]

that results in a useless clone in the case of String when you don't have colour enabled.

[rphmeier]

fair enough, but this code does reallocate borrowed strings when missing color and the end results are also allocated with format!. To avoid all unnecessary allocations, I suggest

use std::borrow::Cow;
use std::convert::AsRef;

trait Applyable: AsRef<str> {
    fn apply(&self, c: Style) -> Cow<str>;
}

impl<T: AsRef<str>> Applyable for T {
    fn apply(&self, c: Style) -> Cow<str> {
        let s = self.as_ref();
        match USE_COLOR.load(Ordering::Relaxed) {
            true => Cow::Owned(format!("{}", c.paint(s))),
            false => Cow::Borrowed(s),
        }
    }
}