Update tests of query_transformation feature #66

Test effects of transformation on prepared statements.
Test C++11 lambda as query transformation function.
Test simple no-op transformation.
Untabify
Disable CTest submissions to CDash

Tests result submission to cdash.org is still configured in
CTestConfig.cmake file, but at the moment we don't use it. In future, we
may want to re-enable it to let users help us testing, but then we will
have to review and test the submission actually works.

[ci skip]
Change version to 3.2.0 as current release

List DB2 and Firebird as supported database systems

[ci skip]
Prepare for documentation of release 3.2.0

Introduce versioned documentation copied to folders, one per each
release.
Documentation for previous releases will be copied from source packages
or release branches.

[ci skip]
Remove target="_blank" from doc.html link

[ci skip]
Split basics.html into two separate pages

Rename basics.html to connections.html
Add queries.html with simple queries copied from connections.html

[ci skip]
Update copyright notice

Update years of copyright of individual pages according to git log

[ci skip]
Document query transformation feature

Close #66

[ci skip]
Update query transformation feature doc

Refer to prefix_with function from SQLAlchemy Expressions API as similar
technique.
Document CMake options for DB2 and Firebird (#85)

Add minor other updates and formatting

[ci skip]
Add DB2 backend doc

Page db2.html is work in progress, I lack of details myself.

[ci skip]
Deprecate Makefile.basic build method (#85)

Unless there is a maintainer willing to take care of these Makefiles,
they are considered as obsolete and may be removed in future.

[ci skip]
Add DB2 features update in doc

Update received from Denis Chapligin.
Work in progress.

[ci skip]
Added a test documenting the current (imperfect) requirements for
using soci::row to retrieve integral values of various types.
Merge branch 'master' of https://github.com/SOCI/soci
One more test, to verify that all string types can be read with
the dynamic binding interface.
MySQL backend documentation update.
Add testing against clang
Add virtual constructor missing from #82

query_transformation_function is pure virtual class