Update dockerfiles to ubuntu-20.04 and autoconf

The nvidia/cuda:10.2 image disappeared from the hub, so the GPU
versions in master were not buildable anymore.  Also, the two that
build bifrost were not yet using the configure script.

However, the full-build `.gpu` version doesn't quite work because
nvidia-docker seems to provide access to GPU during run phase, but not
during build phase.  Perhaps relevant:
https://stackoverflow.com/questions/59691207/docker-build-with-nvidia-runtime

The `_prereq.gpu` version builds fully and is still helpful.

Also pinging PR #92 which is outdated but relevant.

Dockerfile.cpu

@@ -1,28 +1,46 @@
-FROM ledatelescope/bifrost:cpu-base
+FROM ubuntu:20.04
 
 MAINTAINER Ben Barsdell <[email protected]>
 
 ARG DEBIAN_FRONTEND=noninteractive
 
-ENV TERM xterm
-
 # Get dependencies
 RUN apt-get update && apt-get install -y --no-install-recommends \
-        python-pip \
+        build-essential \
+        curl \
+        git \
+        pkg-config \
+        software-properties-common \
+        python3 \
+        python3-dev \
+        python3-pip \
+        python-is-python3 \
         pylint \
+        doxygen \
+        exuberant-ctags \
+        nano \
+        vim \
         && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
-# Update ctypesgen
 RUN pip --no-cache-dir install \
-        ctypesgen==1.0.2
+        setuptools \
+        numpy \
+        matplotlib \
+        contextlib2 \
+        simplejson \
+        pint \
+        ctypesgen==1.0.2 \
+        graphviz
+
+ENV TERM xterm
 
 # Build the library
 WORKDIR /bifrost
 COPY . .
-RUN make clean && \
-    make -j NOCUDA=1 && \
+RUN ./configure --disable-cuda && \
+    make -j && \
     make doc && \
     make install
 

Dockerfile.gpu

@@ -1,4 +1,4 @@
-FROM nvidia/cuda:10.2-devel-ubuntu18.04
+FROM nvidia/cuda:12.2.0-devel-ubuntu20.04
 
 MAINTAINER Ben Barsdell <[email protected]>
 
@@ -11,9 +11,10 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         git \
         pkg-config \
         software-properties-common \
-        python \
-        python-dev \
-        python-pip \
+        python3 \
+        python3-dev \
+        python3-pip \
+        python-is-python3 \
         pylint \
         doxygen \
         exuberant-ctags \
@@ -38,7 +39,7 @@ ENV TERM xterm
 # Build the library
 WORKDIR /bifrost
 COPY . .
-RUN make clean && \
+RUN ./configure && \
     make -j && \
     make doc && \
     make install

Dockerfile_prereq.gpu

@@ -1,4 +1,4 @@
-FROM nvidia/cuda:10.2-devel-ubuntu18.04
+FROM nvidia/cuda:12.2.0-devel-ubuntu20.04
 
 MAINTAINER Ben Barsdell <[email protected]>
 
@@ -11,9 +11,11 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         git \
         pkg-config \
         software-properties-common \
-        python \
-        python-dev \
-        python-pip \
+        python3 \
+        python3-dev \
+        python3-pip \
+        python-is-python3 \
+        pylint \
         doxygen \
         exuberant-ctags \
         nano \