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GHC 7.6 still distributes by default with an old version of process, which
means that requiring the most recent version prevents GHC from properly
bootstrapping out of the box.  In this patch, we relax the version requirement
on process, disabling proper ctl-c handling when the version is not sufficiently
new.

Perhaps one problem with lowering the bound, is if someone attempts to install
Cabal out of the box on GHC 7.6, the dependency solver will prefer the old
installed version, so it is very easy to end up with a cabal-install which
doesn't have working ctl-c.
Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

See discussion in #1763.

Better message when new cabal-install available

In accordance with @23Skidoo's comments on github.

A common mistake new users of cabal-install seem to make is to run
`cabal update`, see the message "Note: there is a new version of
cabal-install available.", accordingly install a new version of
cabal-install by doing `cabal install cabal-install`, neglect to make
sure that the newly installed cabal-install executable is in their path,
and continue to run the cabal-install executable they had before.  The
next time they do `cabal update`, they see the same message and become
confused.

This commit changes the message in question to be more informative and
helpful.  In particular, if the currently running version of
cabal-install is older than the newest version available from hackage,
the user will not be told simply that "there is a new version of
cabal-install available", but rather will be informed exactly what new
versions are available, and what version they are currently running,
along with a hint to change their $PATH variable if it turns out they're
not running the version of cabal-install they thought they were.

enable pkgconfig-depends for tests and benchmarks

implement a common BuildInfo processor for all package components

change names of component BuildInfo processors to be more descriptive

Pretty print fixes

Pretty print the fields of flags nested.

Remove the special casing for strings starting with a newline.
Handle all newlines in strings the same way, by replacing them
with a '.'.

Fixes #1994 (hopefully).

Small cleanup

Included targets in cabal's bash-completion.

Self-constraint not included in frozen constraints

Use SVG for the Travis badge in the README

Refactor exec command to use the ConfiguredProgram abstraction

Some stylistic changes have been made but otherwise this works in the same
manner as the original implementation.

Fix dead link to parsing paper

See also ghc/ghc@1c0b5fdc for more details

A duplicate definition was somehow added while merging and was causing
build failures.

Post cabal-install-1.20.0.3 release.

Conflicts:
	Cabal/Cabal.cabal
	Cabal/Makefile
	cabal-install/cabal-install.cabal

Document 'cabal test --show-details=streaming' (#1964)