Fix many package descriptions

(My OCD kicked in today...)

Remove repeated package names, capitalize first word, remove trailing
periods and move overlong descriptions to longDescription.

I also simplified some descriptions as well, when they were particularly
long or technical, often based on Arch Linux' package descriptions.

I've tried to stay away from generated expressions (and I think I
succeeded).

Some specifics worth mentioning:
 * cron, has "Vixie Cron" in its description. The "Vixie" part is not
   mentioned anywhere else. I kept it in a parenthesis at the end of the
   description.

 * ctags description started with "Exuberant Ctags ...", and the
   "exuberant" part is not mentioned elsewhere. Kept it in a parenthesis
   at the end of description.

 * nix has the description "The Nix Deployment System". Since that
   doesn't really say much what it is/does (especially after removing
   the package name!), I changed that to "Powerful package manager that
   makes package management reliable and reproducible" (borrowed from
   nixos.org).

 * Tons of "GNU Foo, Foo is a [the important bits]" descriptions
   is changed to just [the important bits]. If the package name doesn't
   contain GNU I don't think it's needed to say it in the description
   either.

1 files changed, 5 insertions, 1 deletions

diff --git a/pkgs/tools/misc/ldapvi/default.nix b/pkgs/tools/misc/ldapvi/default.nix
index 28d9b4863d4..6dba834e8be 100644
--- a/pkgs/tools/misc/ldapvi/default.nix
+++ b/pkgs/tools/misc/ldapvi/default.nix
@@ -21,7 +21,11 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    description = "ldapvi is an interactive LDAP client for Unix terminals. Using it, you can update LDAP entries with a text editor";
+    description = "Interactive LDAP client for Unix terminals";
+    longDescription = ''
+      ldapvi is an interactive LDAP client for Unix terminals. Using it, you
+      can update LDAP entries with a text editor.
+    '';
     homepage = http://www.lichteblau.com/ldapvi/;
     license = licenses.gpl2;
     maintainers = with maintainers; [ iElectric ];