This commit hooks the Makefile up to generate a FISH_BUILD_VERSION
symbol and kills off PACKAGE_VERSION in .cpp files.
It also modifies the tarball generation script to add the necessary
version file for releases.
The compiled-in path to bin dir was not correct; it made the
common assumption that `$(prefix)` == `$(prefix)/bin` which is
usually true, but not in all cases.
1. [machine specific files](http://www.gnu.org/prep/standards/html_node/Directory-Variables.html#index-exec_005fprefix)
should use `$(exec_prefix)` (`@exec_prefix@` in Makefile.in)
instead of the usual `$(prefix)`.
2. [executable programs](http://www.gnu.org/prep/standards/html_node/Directory-Variables.html#index-bindir)
should use the more-specific `$(bindir)` (`@bindir@` in Makefile.in)
instead of assuming `$(exec_prefix)/bin` as this allows the
executable install location to be changed with the
`--bindir=_foo_` option to `./configure`.
Fortunately, the makefile is mostly correct and *installs* the
executable in the correct location. The problem shows up later
such as during tab-completion, when fish_pager is run - the
compiled-in path it uses was the incorrect `$(prefix)/bin`
resulting in an "Unknown command" error, which only required
this small fix.
- etc/config.fish and share/config.fish are now "universal" and no longer reference install paths or need to be touched by autotools. They've been removed from config.fish.in to config.fish.
- fish now attempts to determine __fish_datadir and __fish_sysconfdir relative to the path of the fish executable itself (typically by walking up one directory). This means that you can copy the directory hierarchy around and things will still work. The compiled-in paths are used as a backup.
- The fish Xcode project now can build fish natively, without needing autotools.
- Version bumped to 2.0
