Fix test documentation

scons build command not necessary
add support for jdbc internal queries
Merge branch 'u/jbecla/DM-1539'
Improve Debian Wheezy list of dependencies
Make automated install tool more shell portable

Nevertheless LSST stack require bash, forcing
parent script qserv-install.sh to use also bash.
Add Dockerfile for Debian:stable

This Dockerfile install Qserv on Debian Wheezy.
Launch mono-node integration tests in Dockerfile
Provide clear Docker use cases
Remove Qserv configuration & tests from Docker image

So that image is smaller.
Improve rst documentation architecture

Each sub-section is in a sub-directory which
contains an index.rst file.
Document Docker basic use cases
Add bash dependency in Dockerfile

Indeed, LSST environment uses bash.
Fix typo in automated install script
Improve 'Docker images cleaning' documentation