adding some dev tools used in geocat that are probably generally useful for all dev

Dockerfile

@@ -18,7 +18,7 @@ ENV NC4C_VERSION 4.4.1
 RUN apt-get update && apt-get install -y byacc bison diffutils flex make
 
 # grab some convenience packages for using it as a build "machine"
-RUN apt-get install -y vim
+RUN apt-get install -y vim less tree screen unzip cvs subversion gdb valgrind
 
 # this is our install dir for everything non-core
 RUN mkdir -p ${OPT}