Add sphinx installation on test machine

for_tests/Dockerfile

 from ubuntu:16.04
 
+
 # Update apt-get packages
 RUN apt-get update &&\
     apt-get -y upgrade
 
-# Install package needed
+
+# Install package needed and update pip
 RUN apt-get install -y \
         wget \
         python3-pip \
         cmake  # to install mmseqs
 
-# Update pip
 RUN pip3 install --upgrade pip
 
+
 # Install barrnap
 WORKDIR /tmp
 RUN wget https://github.com/tseemann/barrnap/archive/0.8.tar.gz &&\
     tar -xf 0.8.tar.gz &&\
-    rm 0.8.tar.gz
-RUN mv /tmp/barrnap-0.8/bin/barrnap /usr/local/bin
-# Remove heavy useless files
-RUN rm -r /tmp/barrnap-0.8/examples /tmp/barrnap-0.8/build/*.aln
+    rm 0.8.tar.gz &&\
+    mv /tmp/barrnap-0.8/bin/barrnap /usr/local/bin  &&\
+    # Remove heavy useless files
+    rm -r /tmp/barrnap-0.8/examples /tmp/barrnap-0.8/build/*.aln
+
 
 # Install prokka:
 WORKDIR /tmp
@@ -30,17 +33,23 @@ RUN apt-get install -y\
         libdigest-md5-perl \
         git \
         default-jre \
-        bioperl
-RUN git clone https://github.com/tseemann/prokka.git
-RUN /tmp/prokka/bin/prokka --setupdb
-RUN ln -s /tmp/prokka/bin/prokka /usr/local/bin
+        bioperl &&\
+    git clone https://github.com/tseemann/prokka.git
+RUN /tmp/prokka/bin/prokka --setupdb &&\
+    ln -s /tmp/prokka/bin/prokka /usr/local/bin
+
 
 # Install mmseqs2
 WORKDIR /tmp
 RUN wget https://mmseqs.com/latest/mmseqs-static_sse41.tar.gz &&\
     tar xf mmseqs-static_sse41.tar.gz &&\
-    rm mmseqs-static_sse41.tar.gz
-RUN mv /tmp/mmseqs2/bin/mmseqs /usr/local/bin
-# remove useless files
-RUN rm -r /tmp/mmseqs2
+    rm mmseqs-static_sse41.tar.gz &&\
+    mv /tmp/mmseqs2/bin/mmseqs /usr/local/bin &&\
+    # remove useless files
+    rm -r /tmp/mmseqs2
+
+
+# Install sphinx
 
+RUN pip3 install sphinx &&\
+    pip3 install sphinx_rtd_theme
\ No newline at end of file