Reshuffle czar and css python to simplify layout; rework SConscript to accomodate

Implement snapshot with newer kvinterface.

Having css python under core/modules forced the build system to accommodate
having multiple python modules (with swig) in one system. The build system
also needed support for internal shared libraries so that multiple swigged
c++ code could share code, breaking the previous model where all required
.cc files were linked directly into the swigged python .so.
Fix wait-bug in Executive
Fix getChildren for KvInterfaceImplMem causing failure in testFacade
Remove KvInterfaceImplZoo
Remove AsyncQueryManager, ChunkQuery, and most of dispatcher.cc
Fix typo bug introduced in DM-1249 with qservAdmin.py

DM-1249 introduced a regression (spelling problems) that was exposed
by trying admin/tests/test_qservAdmin.py .
Merge branch 'u/danielw/DM-1395'. Closes DM-1395
Introduce CSS version checking code.

See ticket DM-1453, CSS code is modified to store version number when
first database is created in CSS in qservAdmin class. All other methods
in qservAdmin check version agains stored version number, same check is
done when css/Facade instance is created. If check fails then
corresponding exception is generated. Version number is defined in two
places nor - qservAdmin.py and css/Facade.cc. Eventually we'd like to
merge that code into one.
Merge branch 'u/salnikov/DM-1453'
Fix Qserv quick-start documentation

* LSST repository URL is now correct.
* Document use of eups tag for installing Qserv
  releases.
Merge branch 'u/fjammes/DM-1475'
Fix chunkListFile name

Replace generic chunkListFile name with running test case in
qserv-czar.cnf, config.py and metadata.py
Remove creation of LSST database

Comment out creation of empty LSST database during configuration
for master and worker
Fix mysql and qserv connection tools

Updated mysql and qserv connection scripts for better formatting
Add review comments

Made changes from DM-658 review comments
Merge branch 'u/vaikunth/DM-658'
Fix related to queries with c-style comments
Merge branch 'u/jbecla/DM-1601'
fixed the fix related to queries with c-style comment
Use of boost::make_shared in wcontrol

Perform only trivial replacements:
no update in const keyword use (make_shared
requires a const parameter in object
constructor)