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Fixes #2060.

And should be faster.

Edward Z. Yang authored Aug 26, 2014 and Mikhail Glushenkov committed Oct 23, 2014

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

This means that if 'hyperlink-source' is set to True, but the 'HsColour'
executable is not present, documentation will be still generated.

Note that 'cabal hscolour' will still exit with error in this case.

Make the default doc index file path compiler/arch/os-dependent.

Bertram Felgenhauer authored Sep 07, 2014 and Mikhail Glushenkov committed Oct 21, 2014

The motivation is to be able to say --constraint 'foo -none' to prevent
'foo' from being considered when installing packages. See #2092.

cabal-install: Add command 'cabal user-config diff'.

Fixes #2171.

The 'user-config' command allows pseudo-diff-ing and updating of the
user's ~/.cabal/config file. The diff is against what cabal would
generated if the user config file did not exist and the update
command overlays the user's existing settings over the current
version of the default settings and writes it back to ~/.cabal/config.

Closes: #2159

Remove support for Hugs and NHC98.

Remove the self-upgrade check.

Fixes #2130.

GhcOptions: use `NubListR` where appropriate. 

Some Cabal API clients apparently use `foldl mappend` on large lists of
`GhcOptions` records. Fixes #2110.

Fixes #2089.

Fixes #2135.

Nublist

User config fields like 'remote-repo', 'extra-prog-path' and 'build-summary'
were lists, which mean that when two SavedConfig types were concatentated
the lists for these fields were concatenated, resulting in duplicate entries.
Duplicated entries in these fields simply don't make sense, so we swicth to
NubList for these fields.

Closes: #2160

A NubList is a list where all elements are unique, but are maintained in
their original order. The Monoid NubList's mappend implement is just:

    NubList xs `mappend` NubList ys = NubList . nub $ xs ++ ys

which preserves NubList's required properties (ordering and unique-ness
of elements) and meets the requirements of the Monoid laws (identity,
associativity and closure).

These functions are from Mikhail Glushenkov's cabal/ghc-options-union
branch.

Fixes #2162.

Workaround for GHC issue 8825.

cabal-install/IndexUtils : Expose function getIndexFileAge.