See merge request !1395

See merge request !1402

See merge request gaudi/Gaudi!1380

`DECLARE_COMPONENT_PROPERTY( MyComponent, "myprop", "value" )` can be
used to set properties on already declared components.

See merge request gaudi/Gaudi!1396

Sometimes it is useful to be able to deprecate components, i.e. to
make sure a particular job does not use a certain set of components
(e.g. a multi-threaded job should not use components that are known to
be not thread-safe).

This can now be achieved by setting the "deprecated" property in the
plugin registry:
```
  Registry::instance().addProperty( "MyTool", "deprecated", "optional message" );
```

In addition, the warning can be turned into an error using the new
`setError` method.

See merge request !1400

See merge request !1399

Closes lhcb/Gaudi#3

See merge request !1397

See merge request !1381

Closes #236

See merge request !1398

See merge request gaudi/Gaudi!1394

Closes #240

See merge request !1392

Previously the basket size configuration could only be coarsely applied to all
branches but in most real world files the size of the data in each branch varies
significantly. Setting a small value causes large branches to be packed into
individual baskets and prevents effective compression. Setting a large value
improves the compression ratio of large branches but causes excessive memory
usage.

Instead we change the parameters to only specifiy the maximum and minimum
branch size and provide a target for the number of events to pack into each
basket. We then use the first event to estimate the size of the branch.

This makes the branching very sensitive to the first event size however this
seems to work okay in practice. If needed the basket sizes could be refined
after several events to give a more precise estimate.

See merge request !1391

See merge request !1393

See merge request !1390

See merge request !1389

See merge request !1388

See merge request !1387

See merge request !1386

See merge request !1384