Add Warning and comment about ignore rules that target an existing member but do not have it as a source
No longer ignore rules that target an existing member but do not have it as a source; instead this rule signal that the input should be ignored.
Issue an error/warning when the source field of a rule is not a list of "type name"
Revert "Issue an error/warning when the source field of a rule is not a list of "type name""

This reverts commit 141f534e4dfd5fd1ff0346716a7e9f0bd39fa8a1.
Redo: Issue an error/warning when the source field of a rule is not a list of "type name"

Only complain when the rule has a function/code and not when it is only
an 'attribute' rule.

Extend the information printed in case of rule problems:

WARNING: IO rule for class MyClass - type required when listing a rule's source: source="fTwo"
The following rule has been omited:
   read sourceClass="MyClass" targetClass="MyClass" source="fTwo" target="fTwo" code="{ fTwo = -1; newObj->reset1(); }";
Fixes for JIRA-5298

  o RooAbsOptTestStatistic

    - In initSlave() move reattachement of branch buffers from interval vars to pdfs vars
      _after_ data->checkValidBins() as the latter won't work anymore after the redirect.

  o RooAbsPdf

    - Support specification of multiple fit ranges createChi2(RooDataHist&,..) and
      thus implicitly in fitChi2To(RooDataHist&...).

  o RooAbsReal

    - Redirect call of createChi2 with TList of RooCmdArgs to createChi2 with
      explicit list of arguments instead of calling RooChi2Var ctor directly in both
      (so that only one of the two needs to overridden in derived class RooAbsPdf)
Fix handling of rules for unversioned classes.

Unversioned classes' default version number is technically -1,
so we need to properly account for this in TSchemaRule::TestVersion
so that the rule applies to the default unversioned schema when
the rule specifies version="[1-]"
Don't complain about missing dictionary for artifical elements
make version v5-34-09.
std::vector<bool> specialization for __setitem__
Consolidate handling of TGFileBrowser* TEveBrowser::fFileBrowser member, see
ROOT-5294.

Add 'SetFileBrowser(TGFileBrowser*)' method.

Add bool flag to 'TGFileBrowser* MakeFileBrowser(Bool_t make_default=kFALSE)'.
TSQLite-classes to access sqlite3-databases. See ROOT-5256.

The attached patches add the following classes:
TSQLiteResult
TSQLiteRow
TSQLiteServer
TSQLiteStatement
and corresponding integration into both the ROOT-buildsystem and cmake.
Naturally, also the macro for the plugin-manager is included.
Patches supplied for ROOT 5.34.08 and current master (as SQL-part is
rarely changing, this statement should stay valid at least for some months).

Some usage notes:

* The handed path is evaluated as URI by sqlite3, which means it can be
  a relative or absolute path and can even contain additional settings
  as "URI" parameters, which are described in the SQLite-documentation.
* Functions "{Create,Select,Drop}
  DataBase(s)", "Reload", "Shutdown" are not implemented as SQLite
  operates on one DB per file only. The implemented stub methods return
  appropriate error results.
* "TSQLiteServer::GetColumns()" is not implemented (i.e. returns error
  and value 0): This is sadly not possible via a query in SQLite by
  their API design. This also means the TableInfo-objects cannot be queried.
* The result-row-count of a TSQLiteResult is always -1, as SQLite does
  not know the number of result rows before all have been retrieved
  (a valid optimization for a file-only DBMS).

For the person reviewing this patch, please note that the indices of
bind_parameters in SQLite start from 1, while those for the result-columns
start from 0.

As this is a rather large featureset to cover and the software of our
experiment currently only uses a small subset of it (only 'reading'
statements, and no prepared statements), I also wrote a very simple
testing-tool which creates a new database with a table with 10 columns
of very different type, inserts some example data, and rereads that
data both using a simple Query() and using a prepared Statement().
This tool and a very short makefile to build it are also attached if
needed for the review-process. The tool uses the commands described
in the documentation of the abstract baseclass TSQLStatement to
simulate real-life behaviour.
Please note that tool is rather hacked-together without real error-handling,
as it is not meant for long-term usage, but might be helpful in the
review-process / adapted to a unit-test.

Apart from the mentioned specifics, nothing is really SQLite-only,
thus I did not change the documentation of the baseclass in the patch
(this documentation also lists all SQL-implementations). At least this
list in the documentation might be extended to make users aware of the
new implementation.
Add Oliver Freyermuth fro SQLite plugin.