Clean up dependency information

- libzmq required version was much older than we actually require

- libnorm and libpgm are transitive dependencies of libzmq3, it makes no
sense to list them here (rather the libzmq3-dev package should depend on
them if they are needed).

- gtest is now always build from the submodule copy

- the readline dev package was wrong for debian/ubuntu.

README.md

@@ -48,18 +48,15 @@ library archives (`.a`).
 | pkg-config   | any           | NO       | `pkg-config`         | `base-devel` | `pkgconf`           | NO       |                  |
 | Boost        | 1.58          | NO       | `libboost-all-dev`   | `boost`      | `boost-devel`       | NO       | C++ libraries    |
 | OpenSSL      | basically any | NO       | `libssl-dev`         | `openssl`    | `openssl-devel`     | NO       | sha256 sum       |
-| libzmq       | 4.0.0         | NO       | `libzmq3-dev`        | `zeromq`     | `zeromq-devel`      | NO       | ZeroMQ library   |
-| OpenPGM      | ?             | NO       | `libpgm-dev`         | `libpgm`     | `openpgm-devel`     | NO       | For ZeroMQ       |
-| sqlite3      | ?             | YES      | `libsqlite3-dev`     | `sqlite`     | `sqlite-devel`      | NO       | Loki Name System |
-| libnorm[2]   | ?             | NO       | `libnorm-dev`        |              |               `     | YES      | For ZeroMQ       |
+| libzmq       | 4.3.0         | YES      | `libzmq3-dev`        | `zeromq`     | `zeromq-devel`      | NO       | LokiMQ library   |
+| sqlite3      | ?             | NO       | `libsqlite3-dev`     | `sqlite`     | `sqlite-devel`      | NO       | Loki Name System |
 | libunbound   | 1.4.16        | NO       | `libunbound-dev`     | `unbound`    | `unbound-devel`     | NO       | DNS resolver     |
 | libsodium    | ?             | NO       | `libsodium-dev`      | `libsodium`  | `libsodium-devel`   | NO       | cryptography     |
 | libunwind    | any           | NO       | `libunwind8-dev`     | `libunwind`  | `libunwind-devel`   | YES      | Stack traces     |
 | liblzma      | any           | NO       | `liblzma-dev`        | `xz`         | `xz-devel`          | YES      | For libunwind    |
-| libreadline  | 6.3.0         | NO       | `libreadline6-dev`   | `readline`   | `readline-devel`    | YES      | Input editing    |
+| libreadline  | 6.3.0         | NO       | `libreadline-dev`    | `readline`   | `readline-devel`    | YES      | Input editing    |
 | ldns         | 1.6.17        | NO       | `libldns-dev`        | `ldns`       | `ldns-devel`        | YES      | SSL toolkit      |
 | expat        | 1.1           | NO       | `libexpat1-dev`      | `expat`      | `expat-devel`       | YES      | XML parsing      |
-| GTest        | 1.5           | YES      | `libgtest-dev`[1]    | `gtest`      | `gtest-devel`       | YES      | Test suite       |
 | Doxygen      | any           | NO       | `doxygen`            | `doxygen`    | `doxygen`           | YES      | Documentation    |
 | Graphviz     | any           | NO       | `graphviz`           | `graphviz`   | `graphviz`          | YES      | Documentation    |
 | lrelease     | ?             | NO       | `qttools5-dev-tools` | `qt5-tools`  | `qt5-linguist`      | YES      | Translations     |
@@ -70,7 +67,6 @@ library archives (`.a`).
 
 [1] On Debian/Ubuntu `libgtest-dev` only includes sources and headers. You must
 build the library binary manually. This can be done with the following command ```sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo cmake . && sudo make && sudo mv libg* /usr/lib/ ```
-[2] libnorm-dev is needed if your zmq library was built with libnorm, and not needed otherwise
 
 Install all dependencies at once on Debian/Ubuntu: