Cli improvements

[phadej]

Two first commits are trivial UI improvements.

Third probably needs an explanation. I was almost hit by the situation where I increased the upper bounds of my dependencies, but there aren't valid install-plan which would contain actually newest versions of packages. Therefore I could be given an expression that my package works against new version of some dependency, but actually it doesn't.

For example, if I add vector: >=0.9 && <0.11 direct dependency to reflex-0.3:

packdeps reflex.cabal
reflex-0.3: Can use newest versions of all dependencies

But if I run with --recursive flag, I get a lot of output with some interesting information:

packdeps --recursive reflex.cabal
reflex-0.3: Can use newest versions of all dependencies

Transitive dependencies:
reflex-0.3: Can use newest versions of all dependencies
base-4.8.1.0: Can use newest versions of all dependencies
ghc-prim-0.4.0.0: Can use newest versions of all dependencies
dependent-sum-0.2.1.0: Can use newest versions of all dependencies
dependent-map-0.1.1.3: Can use newest versions of all dependencies
containers-0.5.6.3: Can use newest versions of all dependencies
array-0.5.1.0: Can use newest versions of all dependencies
deepseq-1.4.1.1: Can use newest versions of all dependencies
semigroups-0.16.2.2: Can use newest versions of all dependencies
nats-1: Can use newest versions of all dependencies
mtl-2.2.1: Can use newest versions of all dependencies
transformers-0.4.3.0: Can use newest versions of all dependencies
these-0.4.2: Cannot accept the following packages
bifunctors 5
mtl 2.2.1
profunctors 5.1.1
semigroupoids 5.0.0.4
semigroups 0.16.2.2
transformers 0.4.3.0
vector 0.11.0.0
bifunctors-5: Can use newest versions of all dependencies
semigroupoids-5.0.0.4: Can use newest versions of all dependencies
base-orphans-0.4.4: Can use newest versions of all dependencies
transformers-compat-0.4.0.4: Can use newest versions of all dependencies
profunctors-5.1.1: Can use newest versions of all dependencies
comonad-4.2.7.2: Can use newest versions of all dependencies
tagged-0.8.1: Can use newest versions of all dependencies
distributive-0.4.4: Can use newest versions of all dependencies
vector-0.11.0.0: Can use newest versions of all dependencies
primitive-0.6: Can use newest versions of all dependencies
template-haskell-2.10.0.0: Can use newest versions of all dependencies
pretty-1.1.3.2: Can use newest versions of all dependencies
ref-tf-0.4: Can use newest versions of all dependencies
stm-2.4.4: Can use newest versions of all dependencies
exception-transformers-0.4.0.1: Can use newest versions of all dependencies

[snoyberg]

I just set up Travis on this project, and I'm testing your changes.

[snoyberg]

Merged and released as 0.4.1, thanks!