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.

4 files changed, 4 insertions, 4 deletions

diff --git a/pkgs/tools/text/enscript/default.nix b/pkgs/tools/text/enscript/default.nix
index fe11ec592463..797f5b8b6922 100644
--- a/pkgs/tools/text/enscript/default.nix
+++ b/pkgs/tools/text/enscript/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
   doCheck = true;
 
   meta = {
-    description = "GNU Enscript, a converter from ASCII to PostScript, HTML, or RTF";
+    description = "Converter from ASCII to PostScript, HTML, or RTF";
 
     longDescription =
       '' GNU Enscript converts ASCII files to PostScript, HTML, or RTF and
diff --git a/pkgs/tools/text/mpage/default.nix b/pkgs/tools/text/mpage/default.nix
index 5b95c37c732d..c147b3ea301f 100644
--- a/pkgs/tools/text/mpage/default.nix
+++ b/pkgs/tools/text/mpage/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = {
-    description = "Mpage, many-to-one page printing utility";
+    description = "Many-to-one page printing utility";
 
     longDescription = ''
       Mpage reads plain text files or PostScript documents and prints
diff --git a/pkgs/tools/text/namazu/default.nix b/pkgs/tools/text/namazu/default.nix
index fba52b69fbaf..72caa7ba5cb4 100644
--- a/pkgs/tools/text/namazu/default.nix
+++ b/pkgs/tools/text/namazu/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
   doCheck = !stdenv.isLinux;
 
   meta = {
-    description = "Namazu, a full-text search engine";
+    description = "Full-text search engine";
 
     longDescription = ''
       Namazu is a full-text search engine intended for easy use.  Not
diff --git a/pkgs/tools/text/wdiff/default.nix b/pkgs/tools/text/wdiff/default.nix
index e6fc3510cd40..c07caad15a35 100644
--- a/pkgs/tools/text/wdiff/default.nix
+++ b/pkgs/tools/text/wdiff/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     homepage = http://www.gnu.org/software/wdiff/;
-    description = "GNU wdiff, comparing files on a word by word basis";
+    description = "Comparing files on a word by word basis";
     license = stdenv.lib.licenses.gpl3Plus;
     maintainers = [ stdenv.lib.maintainers.eelco ];
     platforms = stdenv.lib.platforms.linux;