i.e., remove the version from the name. Nix has its own mechanism to
prevent a packages to be upgraded. Instead we distinguish development
version (coq-dev-VERSION) from stable versions (coq-VERSION).
Also remove derivation for coq-8.3-beta0-1 which is now superseded by
coq-devel-8.3pre1.
svn path=/nixpkgs/trunk/; revision=23813
Note: In this version we introduce a new schema for the name of the coq
derivations where the coq version is included in the name (i.e.,
"coq8.3-8.3pre1" instead of "coq-8.3pre1"). The reason for this is that often
coq releases introduce several incompatibilities. Thus I argue that, in
general, users do not want nix-env to upgrade automatically form one release to
another. Also version string "8.3pre1" is used instead of "8.3-rc1" to trigger
the nix mechanism for versions comparison.
svn path=/nixpkgs/trunk/; revision=23803
