we realised we were not converting the right focusing method, so here
are the latest changes to do interaction matrix calculations...
To be continued

has to be started or not when executing tests

 (which can bring some problems like not being hashable).

Exclude invalid test directories instead of including valid ones

See merge request !453

First step by step scans tests

See merge request !452

since creates problems when testing with isinstance() or when emitting signals;
usage of weakref.proxy is replaced with normal weakref and corresponding property getter
that makes the dereferencing

Motion hook (solves #69)

See merge request !438

Fix issue #91

Closes #91

See merge request !448

Support 'a.b' type of channel name in measurement group

See merge request !451

refactor SCPI and keithley to be more compatible with scan engine

See merge request !360

Bug fix: Beacon client not finding server if loopback device is the only IPv4 device

See merge request !449

tango temperature: add value attribute

See merge request !421

requirements: add missing h5py

See merge request !444

requirements: update to handle python 2.6

See merge request !450

Proposal to fix issue #103

Closes #103

See merge request !446

this exception doesn't inherit from Exception, but BaseException instead
(like KeyboardInterrupt for example). In the previous version of the code,
the exception was simply discarded. It has to be handled specifically,
hence `repl._handle_exception(...)`, otherwise the shell exits because the
exception goes through everything and break the REPL.

indeed, `localhost` is not listed as a broadcast interface, so if there
is only the loopback device available as an IPv4 interface and the
beacon server is running on the same host, it was never found.

- removed DEFAULT_MEASUREMENT global
- ACTIVE_MG is a proxy to the active measurement group
- ACTIVE_MG relies on 'get_active()' to get the active measurement group,
if no measurement group is defined an empty measurement group, without
counters, is created
- _active_name() method is split in two: get_active_name() and
set_active_name()
- the active measurement group name is always read from settings (redis)
- get_active_name() returns None if session doesn't have an active
measurement group

shell: add basic logging functions

See merge request !445

Bug fixes regarding bliss tango server start with different axes

See merge request !266